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Questions and answers listed by Topic

Please note!

This is just a selection--

either

or else

Classifications are tentative, and some entries appear under more than one heading. A list of Q&As listed in the order of their submission is on
http://www.phy6.org/StarFList.htm"

Additional questions-and-answers:

"The Great Magnet, the Earth"

In "The Exploration of the Earth's Magnetosphere" on the magnetic environment of Earth in space.

Main Divisions

1. Spaceflight
2. Sun and Solar System
(3. Magnetism)

4. Stars and the Universe
5. General Physics

5a Electromagnetic radiation
5b Gravity
5c Other general physics

6. Elementary Astronomy
7 Earth and its motions

7a. Earth Rotation
7b. Earth atmosphere
7c. Calendar and related items
7d. Shape and size of the Earth
7e. Earth -- other motions

8. Questions about space
9. History
10. Moon
11. Orbits
12. Miscellaneous
13. For Teachers and Students

1. Spaceflight

(1) About asteroids hitting Earth.
(3) Dispensing water at zero-g.
(6) Measuring distance from the Sun.
(8) Acceleration of a rocket.
(24) If light speed sets the limit, why fly into space?
(40) Mission to Mars
(47) Why do Rockets Spin?
(50) The Shapes of Rockets and Spacecraft
(51) Space Debris
(55) Spaceflight Without Escape velocity
(60) Van Allen Belt and Spaceflight
(62) (a) Why are Satellites Launched Eastward?
... and what is a "Sun Synchronous" orbit?
(b) Why are satellites launched from near the equator?
(66) Solar Sails
(80) The De Laval Nozzle
(88) Space Launches by Cannon--A
(89) Space Launches by Cannon--B
(105) History of the use of De Laval's nozzle on rockets
(106) Why don't Space Rockets use Wings?
(114) Why not use a heat shield going up?
(117) Why not use nuclear power for spaceflight?
(125) Re-entry from Space
(139) Operation of Ion Rockets
(141) The De-Laval Nozzle
(142) Why does the space shuttle rotate at take-off?
(160) Holes in a Solar Sail
(168) Fast Trip to Mars (1)
(169) Fast Trip to Mars (2)
(170) Spacecraft Attitude
(179) What would a breach in a space station do?
(187) Launch window of the Space Shuttle
(191) Re-entry from orbit
(192) Effects of weightlessness on one's body
(204) Shuttle orbit and Earth rotation
(210) Removing "Killer Asteroids"
(245) A "short stay on Mars"
(248) Shuttle re-entry from space
(250) How can such small targets be accurately hit so far away?
(253) How can a spacecraft self-rotate?
(254) Stability during a rocket launch
(259) Why do orbits curve?
(270) Launching a Rocket from an Airplane
(274) Gravity Assist
(278) What if we had to give up use of Satellites?
(282) Science Fiction scenario for a Flight to Mars
(289) "Space Elevator"
(300) Why can't the space shuttle reenter "slowly"?
(309) Reducing the fuel weight of the Space Shuttle?
(310) How do Rockets Land?
(312) Circumnavigation of the Sun
(347) Can the plasma that fills space help spaceflight?
(368) Shape of a "bottle rocket
(369) Fantasy spaceflight vs. reality
(389) Spaceflight by waiting for the Earth to turn?
(403) Do Rockets need "something to push against?
(405) Re-entry from orbit
(408) Choosing an Aerospace Career
(442) Firing a cannon straight up
(483) Solar Sails

2. Sun and Solar System
(11) Why don't we feel the Sun's gravity pull?
(13) How does the solar wind move?
(15) What if the Earth's axis were tilted 90° to the ecliptic?
(19) What keeps the Sun from blowing up?
(21) Should we fear big solar outbursts?
(22) Planetary line-up and the sunspot cycle
(23) What are comet tails made of?
(33) Distance to the Horizon on an Asteroid
(49) Why are planets in nearly the same plane?
(53) Contribution of different elements to Sunlight
(69) Clockwise or counter-clockwise?
(71) Density of the Sun's corona and the "Scale Height"
(77) Can geocentrist theory still be possible?
(98) High Temperature in Cold Outer Space
(104) How does the upper atmosphere get so hot?
(107) Distance of horizon on Mars
(116) The unusual rotation of the planet Venus
(132) How hot is the Sun?
(144) What if a Neutron Star hit the Sun?
(148) View of Earth and Moon from Mars
(155) Questions about the Solar Corona:
(1) Why don't its particles separate by weight?
(2) What accelerates the solar wind?
(173) How were planets created?
(176) Sun's Temperature and Energy Density of Sunlight
(189) Picturing the Sun from a different distance
(190) What makes the sun shine so brightly?
(193) Blimps on Mars
(196) Does the solar wind have escape velocity
(212) Is the Sun attached to another star?
(213) What if the Sun turned into a black hole?
(233) Is the Sun on fire?
(243) The Sun's Axis
(265) Mars Sunset
(277) Sound Waves on the Sun?
(279) Rotation of Venus
(282) Science Fiction scenario for a Flight to Mars
(285) Discovering Planets outside the Solar System
(293) How bright is our Sun when seen from space?
(295) Outer limits of the Solar System
(308) Could a (heat resistant!) ship float on the Sun?
(315) Why are planetary orbits eccentric?
(324) Why isn't the solar system stratified by density?
(343) Energy loss rate of our Sun
(344) The Sun's distance
(345) Why does sunlight have a continuous spectrum?
(362) If no stars were seen--could Earth's orbital motion be discovered?
(366) The 2011-2 sunspot maximum
(381) Does the Sun Move?
(385) Why don't gas planets just evaporate?
(386) Source of the Sun's energy
(396A) Posssibility of Asteroid Hitting Earth (1)
(396B) Posssibility of Asteroid Hitting Earth (2)
(398) Global Warming caused by Sun getting nearer?
(416) Fred Hoyle's theory of the Sun's Corona
(421) Is the geocentric theory ruled out?
(425) Does the Sun overhead reduce effective weight?
(438) The year 2012 and a distant companion of our Sun
(440) Getting sucked in by Gravity
(445) The origin of the Solar System
(447) The heat of the Sun's corona
(497) Ptolemaic Theory of Planet Motion

3. Magnetism
Questions about magnetism are answered on the web at
"The Great Magnet, the Earth"
and at
"The Exploration of the Earth's Magnetosphere"

If you are reading this from a compact disk, go to the home pages of the appropriate folder, then search for "Questions and Answers" (at the end of the list of contents). The home pages are

-- For "The Great Magnet, the Earth", go to folder earthmag and open demagint.htm.
-- For "The Exploration of the Earth's Magnetosphere" go to folder Education and open Intro.hrml.

4. Stars and the Universe
(12) How hot are red, white and blue (etc.) stars?
(46) Lightspeed, Hyperspace and Wormholes
(48) Around What does the Sun Revolve?
(61) Nearest Star Outside Our Galaxy
(67) (a) Distance to the Big Dipper
(b) Big Dipper star names
(74) Motion of the Sun through space
(82) What is Gravitational Collapse?
(86) Twinkle, twinkle little star
(112) What if our Sun was a much hotter star?
(129) "Constellation" or "Asterism"?
(135) The Big Bang
(147) What Holds Galaxies Together?
(185) Star positions shifted by the atmosphere
(205) Worrying about Wormholes and Black Holes
(214) Do absorption lines have a Doppler shift?
(228) Does the universe have an axis?
(234) Confusion about the "Big Bang"
(267) The Big Bang
(268) "How Often are Stars Born?"
(273) Which among the brightest stars is closest to N Pole?
(280) "Proper Motion" of Stars
(281) Doppler Shift from the Big Bang
(287) The Hubble Constant
(290) Black Holes
(301) "The Standard Model of the Universe"
(306) "Will the World end in 2012?" (a,b)
(348) Spiral arms of our galaxy
(365) Build a straight tower in warped space?
(370) Telling a 7-year old about stars "dying"
(376) Gamma ray bursts
(376) Gamma ray bursts
(384) Is our galaxy held together by a central black hole?
equilibrium
(388) Solar system motion through the Galaxy
(392) Are our galactic arms winding up or opening up?
(394) Are all stars we see suns?
(400) Empty space behind North Star?
(414) Is the Sun losing mass?
(420) Earth crossing the Galactic Equator?
(423) What is the fate of starlight energy?
(440) Getting sucked in by Gravity
(444) Why are nights dark?
(448) Crossing our galaxy's equator
(465) Rotation of Galaxies
(467) How far to the Pole Star?
(473) Back to the Geocentric Universe?
(477) Dependence of cosmic redshifts on direction
(494) Space and Dark Matter

5. General Physics

5a. General Physics--Electromagnetic Radiation
(101) The effect of the Color of Light on the Output of Solar Cells
(103) What is "radiation"?
(137) The Pressure of Sunlight
(183) How can radio waves carry sound?
(214) Do absorption lines have a Doppler shift?
(215) What are "Electromagnetic Waves"?
(241) Shielding out radio waves
(257) The Color Indigo
(258) Electromagnetic Waves and Electromagnetic Induction
(294) What is a "field"?
(296) Gravitational Energy
(303) Are light sabers possible?
(318) Why doesn't magnetism affect electro-magnetic waves?
(328) Effect of Gravity on Electromagnetic Waves
(413) Experimenting with Microwave Oven
(502) "Black Light Telescope"

5b. General Physics--Gravity
(10) Rebounding ping pong balls and gravity-assist
(11) Why don't we feel the Sun's gravity pull?
(29) Gravity at the Earth's Center
(45) Can Gravity Increase with Depth?
(55) Spaceflight Without Escape Velocity?
(93) Why does Gravity Exist?
(124) Acceleration due to gravity
(219) Gravity at the Earth's center (see #29 above, also #180 in (7e))
(221) Third grader asks: how far to zero gravity?
(242) The way gravity changes with depth
(244) "Gravity Particles"?
(246) Weight and mass
(266) Gravity at the Center of Earth
(290) Black Holes
(294) What is a "field"?
(313) Are nuclear forces merely gravity at very close distance?
(316) Forces on Comet-dwellers
(323) The Coriolis force and more
(328) Effect of Gravity on Electromagnetic Waves
(340) Falling off the Earth's Bottom?
(341) Rolling down a slope
(406) Earth Axis and Gravity
(428) Weight on the Equator and at the Pole
(429) Why doesn't gravity overcome buoyancy?
(478) Difference between Gravity and Magnetism
(488) Calculation of Gravity
(499) Change in Earth's gravity after Tsunamis

5c. General Physics--Misc
(2) The swirling of water in a draining tub.
(8) Acceleration of a rocket.
(9) Rebounding ping pong balls (re. #35)
(10) Rebounding ping pong balls and gravity-assist
(37) Are the Sun's Rays Parallel?
(38) More thrust in reverse than going forward?
(52) Teaching Nuclear Fusion
(70) Isotopes in Center of Earth
(72) Did Tesla extract free energy from thin air?
(98) High Temperature in Cold Outer Space
(118) "Doesn't heat rise?"
(121) Can kinetic energy be reconverted to work?
(123) Speed of toy car rolling off an inclined ramp
(126) Balancing a Bicycle
(143) Cold Fusion
(163) Superposition of Waves
(177) Teaching about energy in 8th grade
(181) Freak waves on the ocean
(202) Three-color vision
(203) Superconductors work, universe expands
--with no energy input. Why?
(218) Any limits to Newton's 2nd Law?
(222) "How does inertia affect a rolling ball?"
(227) Newton's law or Bernoulli's?
(230) Syllabus for catching up on physics
(236) Gases that fill balloons
(239) Sticking a hand out of a window...
(246) Weight and mass
(249) Energy levels: plus or minus?
(253) How can a spacecraft self-rotate?
(263) What keeps Electrons away from the Atomic Nucleus?
(271) The Equation of Continuity
(275) Is the Centrifugal Force "Real"?
(286) Landing speed of airplane
(292) Don't use Diesel fuel in a gasoline engine!
(294) What is a "field"?
(297) Stresses on a Railroad Bridge
(301) "The Standard Model of the Universe"
(313) Are nuclear forces merely gravity at very close distance?
(317) Nuclear reactors and bombs
(321) Science of Clothing
(322) Calculating a Collision
(323) The Coriolis force and more
(327) What's the difference between speed and velocity?
(332) Where does a Flying Bird get its Support?
(334) Why don't waves disturb each other?
(352) The speed at which gravity spreads
(364) Is orbital motion same as free fall?
(349) What powers a glider?
(346) Harry Paul Sprain's perpetual Motion Device
(351) Maximum speed for propeller-driven airplane?
(358) Rope stretched across a long lake...
(361) Charging of Earth by lightning: + or – ?
(371) (1) Why is lightning jagged? (2) What did Tesla do?
(377) Counter-clockwise swirling motion in the atmosphere
(375) Why is hydrogen the fuel of choice?
(395) Newton's 3rd law
(403) Do Rockets need "something to push against"?
(409) Advice for "new" physics teacher
(412) Air Resistance
(417) Why don't Protons and Electrons combine?
(424) Double-slit diffraction of particles
(434) Magnetic Energy
(435) Magnetic Carnot Cycle
(449) Newton's 3rd law--in statics and dynamics
(466) Sailplane flight
(470) Double slit interference experiment in
(490) Confused about "Temperature"
(491) "Negative work" and energy
(492) The Coriolis force on a moving air mass
(495) Newton's 3rd law
(501) Does iron ⁵⁶Fe have the most stable nucleus?

6. Elementary Astronomy
(20) Those glorious Southern Skies!
(90) The Southern Pole of the Sky
(99) Refraction of sunlight and starlight by the atmosphere
(122) Does any location get the same number of sunshine hours per year?
(129) "Constellation" or "Asterism"?
(130) "Position of the Stars when I was Born"
(134) Eclipse of Venus?
(138) How is the instant the seasons change determined?
(151) Altitude of the tail of the Big Dipper
(156) Why does the rising Sun look so big?
(158) Unequal Seasons
(159) Is the Big Dipper visible from Viet Nam?
(175) "Zenial Days" on Hawaii
(194) Planet Mars "huge" in the sky, in August 2005?
(195) Astronomy and telescopes for ones' own children
(198) Portable star finder
(223) What determines the quality of a telescope?
(237) Asian tradition on the start of winter
(260) The "Sundial Bridge" in Redding
(264) The Stars on the Winter Solstice of 2012
(265) Mars Sunset
(288) Are Summer Nights Darker?
(291a) Angle between ecliptic and Milky Way
(298) The constellation of Cassiopeia
(333) Why does Sun seem to move?
(354) Why doesn't the sky fall on us?
(372) How can the north wall of my house be in sunlight?
(374) Dawning of the Age of Aquarius
(382) Can the Sun interfere with the visibility of the Big Dipper?
(422) Does the Southern Sky have a Pole Star?
(443) Does one see half the sky--or more, or less?
(480) Celestial Equator and Ecliptic Equator

7. Earth and its motion

7a. Earth rotation
(2) The swirling of water in a draining tub.
(15) What if the Earth's axis were tilted 90° to the ecliptic?
(26) Why does the Earth rotate? Why is it a sphere?
(59) Changes of the Polar Axis of Earth
(78) Can Earth's rotation reverse, like its magnetic polarity?
(95) What would happen if Earth rotated faster?
(108) Stopping the rotation of Earth?
(120) Why isn't our atmosphere flung off by the Earth's rotation?
(131) Rotation of the Earth's Core"
(165) If the Earth's Rotation would Stop... (1)
(166) If the Earth's Rotation would Change... (2)
(171) What makes the Earth rotate?
(172) Energy from the Earth's Rotation?
(240) One year of continuous sunlight?
(260) The "Sundial Bridge" in Redding
(311) The Earth's Spin reduced by Global Warming
(314) Changing the Earth's Rotation
(333) Why does Sun seem to move?
(339) Latest Sunrise, Earliest Sunset
(367) Is Earth adding mass?
(379) Earth axis tilt and climate (1)
(380) Earth axis tilt and climate (2)
(383) Why can't we feel the Earth's rotation?
(404) Sunrise-Sunset asymmetry
(415) Sun's position at noon, south of equator
(451) What if Earth rotated in only 10 hours?
(475) The centrifugal force from Earth's rotation
(476) Earth's rotation and human lifespan
(496) Shift of Earth Axis in 2012?
(498) Electricity from Earth's Rotation?

7b. Earth atmosphere
(73) What does "lapse rate" mean?
(94) Atmospheric "Thermals"--Triggered by Electric Forces?
(103) Height of the Atmosphere
(178) (1) About the jetstream
(182) Citation on "Bad Greenhouse" web page
(207) The greenhouse effect
(210) Telling a 3-year old about the atmosphere (2 questions)
(217) Why air gets cold higher up--a wrong explanation
(244) "Gravity Particles"?
(262) Remote sensing of Thunderstorms
(269) The Path of Lightning
(299) Tracking of radioactivity carried by winds
(319) Is humanity changing the climate, or is it the Sun and the Earth's magnetism?
(330) The lowest 700 km of our Atmosphere
(325) Tapping Atmospheric Electricity
(336) Big Dipper and Weather
(338) Precession, Greenhouse and more...
(354) Why doesn't the sky fall on us?
(355) Imagine a non-rotating Earth
(371) (1) Why is lightning jagged? (2) What did Tesla do?
(426) Evidence for Global Warming ?
(490) Confused about "Temperature"

7c. Calendar and related items
(17) Where is the boundary between summer and winter?
(54) Jewish Calendar
(57) Does Precession change the Length of a Year?
(87) Teaching about seasons
(110) When does Jewish Sabbath start in the far north?
(226) Does precession affect the timing of summer?
(237) Asian tradition on the start of winter
(238) Why our year starts at January 1
(255) Boiling point of water in space
(260) The "Sundial Bridge" in Redding
(264) The Stars on the Winter Solstice of 2012
(291b) (Continuing 291a)--About the year 2012
(302) About the Maya Calendar
(306) "Will the World end in 2012?" (a,b)
(326) Global Disaster in 2012?
(331) Doomsday 2012?
(363) Local Solar Time in Iceland
(378) Leap years on the Jewish calendar
(391) The year 2012
(399) The year 2012
(401) The year 2012 and the 26,000 year cycle
(407) The year 2012
(418) Days in a Year

7d. Shape and size of the Earth
(26) Why does the Earth rotate? Why is it a sphere?
(56) Who first proposed a round Earth?
(76) Distance to the Horizon
(79) Why is the Earth round?
(107) Distance of horizon on Mars
(162) Science Fair Project on the Size of the Earth
(208) Separation between lines of latitude and longitude
(224) Why design maps around curved lines?
(272) The Four Corners Monument
(305) About Mountains
(323) The Coriolis force and more
(329) Why is North the reference, not South?
(353) Layers of the Earth
(358) Rope stretched across a long lake...
(366) The 2011-2 sunspot maximum
(427) Distances to the Equator
(430) The Prime Meridian
(432) In what direction is Israel from NY?
(436) Defining the Equator
(439) Distance between two points on a sphere

7e. Earth and its other motions
(25) Does precession mis-align ancient monuments?
(58) The Analemma
(69) Clockwise or counter-clockwise?
(70) Isotopes in Center of Earth
(75) Teaching about tides
(81) Why 23.5 degrees?
(113) Finding the north direction
(115) Sun's elevation at noon
(128) Why isn't Longitude measured from 0° to 360°?
(133) How much weaker is gravity higher up?
(154) Shape of the Earth's Orbit
(164) The Sun and Seasons
(174) Does Precession of the Equinoxes shift our Seasons?
(175) "Zenial Days" on Hawaii
(180) Gravity at the Earth's center
(186) The equation of time
(216) Why are the two daily tides unequal?
(304) Can the heat of sunshine make the Earth expand?
(305) About mountains
(323) The Coriolis force and more
(338) Precession, Greenhouse and more...
(398) Global Warming caused by Sun getting nearer?
(401) The year 2012 and the 26,000 year cycle
(473) Back to the Geocentric Universe?
(493) Recent change in sunset?
(499) Change in Earth's gravity after Tsunamis

8. Questions about space
(1) About asteroids hitting Earth.
(28) Where does space begin?
(30) Radiation hazard in space (3 queries)
(34) "Danger, falling satellites"?
(37) Are the Sun's Rays Parallel?
(103) Height of the Atmosphere
(161) Consequences of no more solar X-rays
(225) "Drag" by the Sun on the Earth's motion?
(232) At what distance does Earth start looking spherical?
(248) Shuttle re-entry from space
(255) Boiling point of water in space
(261a) (a) Temperature in space
(261b) (b) Exposure to the space environment: Freeze or burn?
(284) "Iridium" flares
(324) Why isn't the solar system stratified by density?
(350) UFOs
(396A) Posssibility of Asteroid Hitting Earth (1)
(396B) Posssibility of Asteroid Hitting Earth (2)
(405) Re-entry from orbit
(494) Space and Dark Matter
(502) "Black Light Telescope"

9. History
(4) Robert Goddard and World War II.
(41) Kepler's calculation
(54) Jewish Calendar
(56) Who first proposed a round Earth?
(64) Gunpowder and Rockets
(80) The De Laval Nozzle
(105) History of the use of De Laval's nozzle on rockets
(235) How did Tycho calibrate his instruments?
(256) Konstantin Tsiolkovsky
(279) Rotation of Venus
(371) (1) Why is lightning jagged? (2) What did Tesla do?
(416) Fred Hoyle's theory of the Sun's Corona
(430) The Prime Meridian
(442) Firing a cannon straight up
(487) Aristarchus
(497) Ptolemaic Theory of Planet Motion

10. Moon
(5) Asymmetry of the Moon's orbit.
(30) Radiation hazard in space (3 queries)
(42) The Appearance (Phase) of the Moon
(68) Was Moon landing a hoax?
(75) Teaching about tides
(83) Can Earth capture a second moon?
(85) How far is the Moon?
(92) Why does the Moon have bigger craters?
(119) Have any changes been observed on the Moon?
(127) Is Absolute Zero reached on the Moon?
(140) Physical Librations of the Moon
(149) Appearance of the Moon (1)
(150) Appearance of the Moon (2): Does it "roll around"?
(188) No "Man in the Moon" from Australia?
(197) Astronomy for cliff-dwellers of New York City
(199) What if the Moon was closer? (2 questions)
(200) Why doesn't the Moon have an atmosphere?
(247) "The Moon Hoax"
(252) Why the Moon has its phases
(276) How do we know Earth is bigger than the Moon?
(283) Motion of the Moon
(335) Does the Moon's motion Change?
(357) US Flag on the Moon
(419) Position of the Moon in the sky
(437) Second Moon for Earth?
(450) Barycenter of Earth-Moon system
(451) What if Earth rotated in only 10 hours>
(472) On Earth's spin and Moon's appearance

11. Orbits
(5) Asymmetry of the Moon's orbit.
(14) The shape of the orbit of Mars
(27) What's so hard about reaching the Sun?
(32) The Lagrangian L3 point
(34) Overtaking Planets
(35) Falling Towards the Sun
(39) The varying distance between Earth and Sun
(41) Kepler's calculation
(43) Stability of Lagrangian points
(44) Can an Asteroid Impact Change the Earth's Orbit?
(62) (a) Why are Satellites Launched Eastward?
(a) What is a "Sun Synchronous" orbit?
(b) Why are satellites launched from near the equator?
(74) Motion of the Sun through space
(83) Can Earth capture a second moon?
(84) How far does Earth's Gravity Extend?
(96) Where do gravity of Earth and Sun balance?
(167) What if the Earth stopped in its orbit?
(220) Does the Earth follow a "squiggly" orbit?
(245) A "short stay on Mars"
(250) How can such small targets be accurately hit so far away?
(259) Why do orbits curve?
(315) Why are planetary orbits eccentric?
(362) If no stars were seen--could Earth's orbital motion be discovered?
(387) Point of gravity equilibrium
(431) Is L2 in the Earth's Shadow?
(446) Flying to other planets
(448) Crossing our galaxy's equator
(479) SciFi world with ahort days and long nights
(481) Cavendish gravity constant G drops out

12. Miscellaneous
(18) The Ozone Hole
(36) The Polar Bear
(63) How Tall Can People Get?
(72) Did Tesla extract free energy from thin air?
(91) Do Astrologers use Wrong Positions for Planets?
(97) The Ultimate Astronomy Tool
(100) Advice to a would-be astronomer
(109) The equation of a parabola
(110) When does Jewish Sabbath start in the far north?
(111) Where is the center of the global landmass?
(136) Thanks for the "Math Refresher" in Spanish
(145) Why did the Moon appear Red?
(146) Centrifuge for Whirling Astronauts
(152) Sudden decompression, 5 miles up
(153) Do Negative Ions make you Feel Good?
(157) Drawing a Perpendicular Line in Rectangular Coordinates
(184) Do Cosmic Rays produce lightning?
(192) Effects of weightlessness on one's body
(206) What should I study?
(211) Strange light seen from Hawaii
(216) Why are the two daily tides unequal?
(224) Why design maps around curved lines?
(229) Frictional electricity
(230) Syllabus for catching up on physics
(231) Parabolic reflector
(244) "Gravity Particles"?
(251) A teacher asks about compiling lesson plans
(278) What if we had to give up use of Satellites?
(291b) (Continuing 291a)--About the year 2012
(307) Advice to graduating High School Student
(319) Is humanity changing the climate, or is it the Sun and the Earth's magnetism?
(320) Advice to home-schooling parent
(321) Science of Clothing
(331) Doomsday 2012?
(342) Pelton Wheel Efficiency
(350) UFOs
(356) Flying east with a 1° error
(359) About studying electronics in the USA
(360) Publish Stargazers as a book?
(373) Heating the inside of Earth
(390) Does Earth rotation affect size of creatures?
(393) Advice to a home-schooling mother
(397) Author's IQ
(402) "Quarter Squares"
(408) Choosing an Aerospace Career
(410) Paradox of Time
(411) Is 7th grade science boring?
(413) Experimenting with Microwave Oven
(433) Is the World Overpopulated?
(439) Distance between two points on a sphere
(441) The work of Nikola Tesla
(468) Missed Discoveries
(471) Ionizing Radiation and the Origin of Life
(474) Radiation risks from uranium counterweights
(479) SciFi world with ahort days and long nights
(484) Life under stronger gravity
(486) Finding true north in an underground mine

13. For Teachers and Students

Started 2011
(469) Independent study for bright students
(482) Teacher seeks material
(485) Message from Kansas
(489) Message from Michigan
(503) Message from New Jersey

Go to main listing of questions

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Author and Curator: Dr. David P. Stern
Mail to Dr.Stern: stargaze("at" symbol)phy6.org .

Last updated 25 February 2012