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The Answer Man--arranged by subject Site Map

Get a Straight Answer

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.

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.

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

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?

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?

5. General Physics
(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
(11) Why don't we feel the Sun's gravity pull?
(29) Gravity at the Earth's Center
(37) Are the Sun's Rays Parallel?
(38) More thrust in reverse than going forward?
(45) Can Gravity Increase with Depth?
(52) Teaching Nuclear Fusion
(55) Spaceflight Without Escape Velocity?
(70) Isotopes in Center of Earth
(72) Did Tesla extract free energy from thin air?
(93) Why does Gravity Exist?
(94) Atmospheric "Thermals"--Triggered by Electric Forces?
(98) High Temperature in Cold Outer Space
(101) The effect of the Color of Light on the Output of Solar Cells
(103) What is "radiation"?
(118) "Doesn't heat rise?"
(121) Can kinetic energy be reconverted to work?
(123) Speed of toy car rolling off an inclined ramp
(124) Acceleration due to gravity
(126) Balancing a Bicycle
(137) The Pressure of Sunlight
(143) Cold Fusion
(163) Superposition of Waves

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?

7. Earth and its motions
(2) The swirling of water in a draining tub.
(15) What if the Earth's axis were tilted 90° to the ecliptic?
(17) Where is the boundary between summer and winter?
(25) Does precession mis-align ancient monuments?
(26) Why does the Earth rotate? Why is it a sphere?
(54) Jewish Calendar
(56) Who first proposed a round Earth?
(57) Does Precession change the Length of a Year?
(58) The Analemma
(59) Changes of the Polar Axis of Earth
(69) Clockwise or counter-clockwise?
(70) Isotopes in Center of Earth
(73) What does "lapse rate" mean?
(75) Teaching about tides
(76) Distance to the Horizon
(78) Can Earth's rotation reverse, like its magnetic polarity?
(79) Why is the Earth round?
(81) Why 23.5 degrees?
(87) Teaching about seasons
(95) What would happen if Earth rotated faster?
(103) Height of the Atmosphere
(107) Distance of horizon on Mars
(108) Stopping the rotation of Earth?
(110) When does Jewish Sabbath start in the far north?
(113) Finding the north direction
(115) Sun's elevation at noon
(120) Why isn't our atmosphere flung off by the Earth's rotation?
(128) Why isn't Longitude measured from 0° to 360°?
(131) Rotation of the Earth's Core"
(133) How much weaker is gravity higher up?
(154) Shape of the Earth's Orbit
(162) Science Fair Project on the Size of the Earth
(164) The Sun and Seasons

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

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

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"?

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?

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

Go to main listing of questions

Back to the Master List

Author and Curator: Dr. David P. Stern
Mail to Dr.Stern: audavstern("at" symbol)erols.com .

Last updated 11 November 2003