Previously answered questions by Dave Kornreich

(in order of times viewed)

What is the life cycle of a star?
Which planets have rings?
Why do stars twinkle?
How long does it take for the Sun's light to reach us?
How do we know the age of the Universe and the Earth?
Can you hear sounds in space?
What direction do planets rotate?
What is that ring (or rainbow) around the moon?
Can artificial gravity be created in space?
What causes seasons?
What is a nova?
What are RA and DEC?
Who first measured the speed of light?
Where are stars born?
When was the last time all 9 planets were aligned?
How do we know the mass of the Earth and the Moon?
What is the shape of the universe?
Why do planets not twinkle?
What are Altitude and Azimuth?
How did asteroids form and what is the difference between an asteroid and a comet?
What is time dilation?
Why does the Moon look big on the horizon?
How big is the universe?
Can you see satellites?
Do dead stars still shine?
How do you measure the mass of a star?
Why can't you see stars during the day?
How do gravitons escape black holes to tell the universe about their gravity?
Why do all the planets orbit in the same plane?
Where did all the water in the universe come from?
How are elements heavier than iron formed?
Will we get sucked into the black hole at the center of the Milky Way?
Why do stars change colour when they twinkle?
How can two moons of Saturn share the same orbit?
How does light pollution affect astronomers?
Do the Sun's or Earth's magnetic field reverse?
Why is twilight short near the equator?
How do I tell which planet is which?
Which hemisphere has the best view of the Milky Way?
Why is our solar system so different from all the others we've found?
What is a dimension?
Why do we not have eclipses every month?
Why doesn't gravity change the speed of light?
Are time machines possible?
What would happen if you took off your helmet in space?
What are the requirements for being a planet?
If the universe is 15 billion years old, how can it be larger than 15 billion light years across?
Can we find the place where the Big Bang happened?
How do we measure distances to other stars?
Can life exist on the recently discovered extrasolar planets?
Why do most moons orbit their planets at the equator?
Can one star orbit another?
What is a Dyson Sphere?
How can we measure distances to more stars?
Do you believe in UFOs?
How can geometry be different in space?
Do you think it's possible to maintain life on other planets?
When unmanned spacecraft accelerate in space, what causes them to slow down?
Do astronomers believe in astrology?
Have gravitational waves been proven to exist?
What caused Shoemaker-Levy 9 to split up?
Why are there no craters on Earth? Did all the meteorites miss us?
What is sidereal time?
What happens when you change the mass of a White Dwarf or Neutron Star?
Can you tell time by the Big Dipper?
Could we be seeing dead stars?
How do we know if the universe will keep expanding forever?
How powerful are quasars?
What kind of telescope should I use for astrophotography?
What equipment do I need for astrophotography?
Can the theory of formation of the solar system explain all the observables?
Why search for only Earth-like life on other planets?
What makes a satellite geosyncronise itself with Earth's orbit?
Why are there blue shifted galaxies?
If comets are boiling away, why are there any left?
Does the shuttle worry about space junk?
Can HST see the Oort cloud?
What are the boundaries of the constellations?
What's new with the Big Bang?
How could galaxies have gotten so far away in only 15 billion years?
Do electrons age?
Why is it important to study meteorites?
Are the asteroids the remains of a planet which broke apart?
How can I contribute to science as an amateur astronomer?
What kinds of star clusters are there?
What do stellar classifications mean?
How do distant galaxies differ from those nearby?
How are photons created and destroyed?
How can you tell the difference between single and multiple extrasolar planets?
Is cosmic expansion happening on microscopic scales?

URL: http://curious.astro.cornell.edu/authorlist.php?number=1
This page has been accessed 507418 times since September 25, 2002.
Last modified: November 19, 2007 11:28:35 AM

Comments? curious@astro.cornell.edu
Legal questions? See our copyright, disclaimer and privacy policy.
Ask an Astronomer is hosted by the Astronomy Department at Cornell University and is produced with PHP and MySQL.