Ask an Astronomer Team

Christopher Springob

Chris studies the large scale structure of the universe using the peculiar velocities of galaxies.  He got his PhD from Cornell in 2005, and is now a Research Assistant Professor at the University of Western Australia.

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Title Created Date Hits
Did a giant impact cause the Dark Ages? (Beginner) Feb 11 65147
Which way does the sun travel in the southern hemisphere? (Beginner) Apr 05 100707
How can observations of the distant universe prove that the expansion is accelerating *now*? (Advanced) Dec 04 38432
Traveling at light speed, how long would it take to get to the nearest galaxy? (Beginner) Nov 04 214285
Is there a list of the sizes of different kinds of stars? (Beginner) Sep 04 76239
Are the planes of solar systems aligned with the plane of the Galaxy? (Intermediate) Jul 04 167808
Does Cerenkov radiation travel faster than light? (Intermediate) Jun 04 52277
What is the hottest time of day? (Beginner) Jun 04 171221
Why doesn't light from distant galaxies reach us instantaneously? (Intermediate) Mar 04 55175
Does the Sun rotate? (Intermediate) Mar 04 131277
Why is it easier to see a star if you look slightly to the side? (Intermediate) Feb 04 67591
When will Halley's Comet return? (Intermediate) Jan 04 528153
Is the Great Wall the largest galaxy cluster? (Advanced) Jan 04 67480
Why is the WMAP picture of the CMB an ellipse? (Intermediate) Jan 04 52455
Why can we see the sun's image before sunrise and after sunset? (Beginner) Dec 03 152132
Could someone travel the universe in his or her own lifetime? (Beginner) Dec 03 77842
Has anyone made a map of the Milky Way? (Beginner) Nov 03 52730
Did time go slower just after the Big Bang? (Advanced) Oct 03 54518
How long would it take for a mini-black hole to eat the Earth? (Advanced) Sep 03 77117
Does a photon observe other photons moving past it at the speed of light? (Intermediate) Sep 03 52291
Is there a "South Star"? (Intermediate) Sep 03 93116
Could a different theory of gravity explain the dark matter mystery? (Intermediate) Sep 03 49230
Could you escape from a black hole if you were able to go faster than the speed of light? (Intermediate) Aug 03 66137
Do unmanned spacecraft like Voyager travel in straight lines? (Intermediate) Jul 03 57113
How do we know that superclusters are the largest structures in the universe? (Advanced) Jun 03 53964
Why does the apparent density of galaxies drop off at larger distances? (Advanced) Jun 03 51564
Could matter-anti-matter repulsion power the expansion of the universe? (Intermediate) May 03 44776
Can I listen to the SETI@home radio signal? (Beginner) May 03 55776
No matter how fast the universe is expanding, shouldn't gravity eventually make it recollapse? (Intermediate) May 03 38747
Why do so many of the world's UFO sightings happen in America? (Beginner) Apr 03 71309
Can you use an infinite line of reflectors to send light to the edge of the Universe? (Intermediate) Apr 03 61577
How long does it take the Big Dipper to move in the sky? (Intermediate) Mar 03 71946
What would an "open geometry" for the universe look like? (Advanced) Mar 03 56813
What would happen if a supermassive black hole came close to the Earth? (Advanced) Mar 03 119101
How is it that we see farther out in space (farther back in time) than in the past? (Beginner) Mar 03 61747
How can the Sun have such a strong gravitational field if it's made of gases? (Beginner) Mar 03 71688
If the universe is "bounded" today, could it one day become "unbounded"? (Advanced) Mar 03 45338
Don't tachyons travel faster than light? (Intermediate) Mar 03 51380
Do stars' orbits in galaxies obey Kepler's Laws? (Intermediate) Mar 03 50516
Which American colleges teach astronomy? (Beginner) Jan 03 65735
Why do we assume that the universe is homogeneous? (Intermediate) Jan 03 59979
How do astronomers observe the Sun's interior? (Intermediate) Dec 02 56945
How does the Earth compare in size to the entire universe at the present epoch? (Intermediate) Dec 02 51155
Does the Sun have any heavy elements? (Beginner) Dec 02 56510
Is the Sun always up for exactly 12 hours at the equator? (Beginner) Dec 02 183415
What are collections of galaxies called? (Intermediate) Nov 02 74873
How does the Sun compare to other stars? (Beginner) Nov 02 206112
Do stars move in the sky? (Beginner) Nov 02 314247
Which planet is most similar to Earth? (Intermediate) Nov 02 253086
Why do supernova remnants look like rings rather than spheres? (Intermediate) Nov 02 43529
What percent of the time can astronomers observe without interference from the Moon? (Beginner) Oct 02 42266
What would the Big Crunch look like to an observer on Earth? (Advanced) Oct 02 50252
What kind of interference must astronomers contend with when observing? (Beginner) Oct 02 40303
Why does the Sun's apparent path through the sky change throughout the year? (Beginner) Oct 02 141482
Would a planet near the galactic center have a brighter night sky? (Intermediate) Oct 02 83471
Can two lunar eclipses occur in the same month? (Advanced) Oct 02 66825
Is the distance from the Earth to the Sun changing? (Advanced) Oct 02 357596
What is the approximate GPA needed in High School in Math and Science to be an astronomer? (Beginner) Oct 02 76275
Could our position in the universe affect our perceptions of the expansion? (Intermediate) Sep 02 52992

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