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 53623
Which way does the sun travel in the southern hemisphere? (Beginner) Apr 05 73709
How can observations of the distant universe prove that the expansion is accelerating *now*? (Advanced) Dec 04 31786
Traveling at light speed, how long would it take to get to the nearest galaxy? (Beginner) Nov 04 171025
Is there a list of the sizes of different kinds of stars? (Beginner) Sep 04 60210
Are the planes of solar systems aligned with the plane of the Galaxy? (Intermediate) Jul 04 133138
Does Cerenkov radiation travel faster than light? (Intermediate) Jun 04 43041
What is the hottest time of day? (Beginner) Jun 04 154681
Why doesn't light from distant galaxies reach us instantaneously? (Intermediate) Mar 04 46502
Does the Sun rotate? (Intermediate) Mar 04 123309
Why is it easier to see a star if you look slightly to the side? (Intermediate) Feb 04 48848
When will Halley's Comet return? (Intermediate) Jan 04 515930
Is the Great Wall the largest galaxy cluster? (Advanced) Jan 04 60008
Why is the WMAP picture of the CMB an ellipse? (Intermediate) Jan 04 42256
Why can we see the sun's image before sunrise and after sunset? (Beginner) Dec 03 115215
Could someone travel the universe in his or her own lifetime? (Beginner) Dec 03 66296
Has anyone made a map of the Milky Way? (Beginner) Nov 03 46009
Did time go slower just after the Big Bang? (Advanced) Oct 03 44929
How long would it take for a mini-black hole to eat the Earth? (Advanced) Sep 03 64887
Does a photon observe other photons moving past it at the speed of light? (Intermediate) Sep 03 43235
Is there a "South Star"? (Intermediate) Sep 03 79115
Could a different theory of gravity explain the dark matter mystery? (Intermediate) Sep 03 42349
Could you escape from a black hole if you were able to go faster than the speed of light? (Intermediate) Aug 03 53510
Do unmanned spacecraft like Voyager travel in straight lines? (Intermediate) Jul 03 47224
How do we know that superclusters are the largest structures in the universe? (Advanced) Jun 03 45782
Why does the apparent density of galaxies drop off at larger distances? (Advanced) Jun 03 42550
Could matter-anti-matter repulsion power the expansion of the universe? (Intermediate) May 03 36691
Can I listen to the SETI@home radio signal? (Beginner) May 03 46662
No matter how fast the universe is expanding, shouldn't gravity eventually make it recollapse? (Intermediate) May 03 31654
Why do so many of the world's UFO sightings happen in America? (Beginner) Apr 03 58769
Can you use an infinite line of reflectors to send light to the edge of the Universe? (Intermediate) Apr 03 52049
How long does it take the Big Dipper to move in the sky? (Intermediate) Mar 03 58218
What would an "open geometry" for the universe look like? (Advanced) Mar 03 47256
What would happen if a supermassive black hole came close to the Earth? (Advanced) Mar 03 105454
How is it that we see farther out in space (farther back in time) than in the past? (Beginner) Mar 03 53184
How can the Sun have such a strong gravitational field if it's made of gases? (Beginner) Mar 03 53344
If the universe is "bounded" today, could it one day become "unbounded"? (Advanced) Mar 03 37708
Don't tachyons travel faster than light? (Intermediate) Mar 03 44300
Do stars' orbits in galaxies obey Kepler's Laws? (Intermediate) Mar 03 41618
Which American colleges teach astronomy? (Beginner) Jan 03 56548
Why do we assume that the universe is homogeneous? (Intermediate) Jan 03 50160
How do astronomers observe the Sun's interior? (Intermediate) Dec 02 46514
How does the Earth compare in size to the entire universe at the present epoch? (Intermediate) Dec 02 41460
Does the Sun have any heavy elements? (Beginner) Dec 02 46903
Is the Sun always up for exactly 12 hours at the equator? (Beginner) Dec 02 132944
What are collections of galaxies called? (Intermediate) Nov 02 58197
How does the Sun compare to other stars? (Beginner) Nov 02 176593
Do stars move in the sky? (Beginner) Nov 02 245776
Which planet is most similar to Earth? (Intermediate) Nov 02 187097
Why do supernova remnants look like rings rather than spheres? (Intermediate) Nov 02 37109
What percent of the time can astronomers observe without interference from the Moon? (Beginner) Oct 02 34643
What would the Big Crunch look like to an observer on Earth? (Advanced) Oct 02 41418
What kind of interference must astronomers contend with when observing? (Beginner) Oct 02 33886
Why does the Sun's apparent path through the sky change throughout the year? (Beginner) Oct 02 111828
Would a planet near the galactic center have a brighter night sky? (Intermediate) Oct 02 74347
Can two lunar eclipses occur in the same month? (Advanced) Oct 02 55872
Is the distance from the Earth to the Sun changing? (Advanced) Oct 02 262217
What is the approximate GPA needed in High School in Math and Science to be an astronomer? (Beginner) Oct 02 65367
Could our position in the universe affect our perceptions of the expansion? (Intermediate) Sep 02 44493

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