Ask an Astronomer Team

Kristine Spekkens

Kristine studies the dynamics of galaxies and what they can teach us about dark matter in the universe. She got her Ph.D from Cornell in August 2005, was a Jansky post-doctoral fellow at Rutgers University from 2005-2008, and is now a faculty member at the Royal Military College of Canada and at Queen's University.

Kristine's email: 

Kristine's websites:

Display # 
Title Created Date Hits
How does the Moon stay "suspended" in the air? (Intermediate) Apr 05 182384
Would the biggest airplanes cause tsunamis if they crashed? (Intermediate) Feb 05 69089
Do we really observe the edges of galaxies at different epochs? (Advanced) Oct 04 70583
Do the Sun's or Earth's magnetic field reverse? (Intermediate) Jan 04 83680
When are there 5 Sundays in February? (Intermediate) Jan 04 91132
Are names given to black holes? (Advanced) Dec 03 108863
How can we find galaxies behind the Milky Way? (Intermediate) Sep 03 100143
Can I communicate faster than light? (Advanced) Aug 03 91820
Is there such a thing as hyperspace? (Intermediate) May 03 66842
How do we know that sunspots are associated with the Sun's magnetic field? (Intermediate) Apr 03 75511
Does inflation allow for an infinite number of universes? (Advanced) Apr 03 63212
What is the origin of the stellar classification system "OBAFGKM"? (Intermediate) Mar 03 92013
How are planets affected by the Hot Ionised Medium? (Advanced) Mar 03 50340
Why don't people walk upside-down on the bottom of the Earth? (Beginner) Mar 03 239374
How long has humanity known that we live in a galaxy similar to others in the Universe? (Intermediate) Feb 03 62917
How are galaxy distances inferred from their recessional velocities? (Intermediate) Jan 03 99621
Did I really hear a meteor? (Intermediate) Jan 03 73780
Do we have to worry about relativity when studying galactic objects? (Intermediate) Jan 03 58033
Does the temperature of matter increase as it is accelerated to relativistic speeds? (Advanced) Dec 02 69507
How do sunrise and sunset times change with altitude? (Intermediate) Nov 02 132214
How do we know what parameters to use when simulating the collision of the Milky Way and Andromeda? (Advanced) Nov 02 75008
Can we look back far enough in time to see the Big Bang? (Beginner) Nov 02 129755
How can the Universe expand faster than the speed of light during inflation? (Advanced) Nov 02 162216
Why is pressure broadening greater in low mass stars than in high mass stars? (Advanced) Nov 02 57687
Why is sea water salty, and not lake water? (Beginner) Nov 02 111848
How many moles of stars are in the known universe? (Beginner) Oct 02 81740
Do binary or triple star systems form together? (Intermediate) Oct 02 64183
Why doesn't dark matter fall into a black hole? (Advanced) Oct 02 89763
Where does the kinetic energy of infalling bodies come from? (Intermediate) Oct 02 60338
Can astronomers observe anything when the moon is full? (Beginner) Oct 02 61392
Is there a beginning and an end to a galaxy's life? (Intermediate) Oct 02 101308
What was that really big falling star that I saw? (Intermediate) Oct 02 77832
How do you calculate the azimuth and altitude of an object? (Intermediate) Oct 02 141076
Is the Moon seen as a crescent (and not a "boat") all over the world? Is the same phase of the moon visible from the Northern and Southern hemispheres? (Advanced) Oct 02 161217
Why are the Moon and Sun sometimes orange or red? (Beginner) Sep 02 526075
What is the origin of spiral structure in galaxies? (Intermediate) Sep 02 107237
Why does the Sun appear larger on the horizon than overhead? (Intermediate) Sep 02 151388
Can I see details on Venus? (Intermediate) Sep 02 80696
Do the magnitudes and colors of stars ever change? (Intermediate) Sep 02 77505
Why was the Platonic year named after Plato? (Intermediate) Aug 02 71398
Can I calculate the size of the Universe by converting light years to kilometres? (Intermediate) Aug 02 100216
Can the acceleration of the Universe be analogous to apparent acceleration in a airplane? (Intermediate) Aug 02 83110
Why do photos of space taken from space never show any stars? (Intermediate) Aug 02 92219
Is the Earth at the centre of the Universe? (Intermediate) Aug 02 116464
How can a star burn with no oxygen? (Beginner) Jul 02 315804
How are galaxies and solar systems similar? (Advanced) Jul 02 91183
Do supermassive black holes cause galaxy rotation? (Advanced) Jul 02 135921
What causes a particle to decay? (Intermediate) Jul 02 74801
Who (and when) discovered that the earth's axis is on a 23 degree tilt? (Intermediate) Jul 02 129313
Why do pictures of distant galaxies have higher resolution than those of nearby planets? (Intermediate) Jun 02 89039
How is the Cepheid yardstick validated? (Advanced) Jun 02 67419
What would happen if you went back in time and killed your grandmother? (Beginner) Jun 02 66034
What colors are visible through an amateur telescope? (Intermediate) Jun 02 80764
What elements make up the Sun? (Beginner) Jun 02 228388
Is it possible to measure the temperature of the Sun? (Beginner) May 02 191006

Most Popular

Our Reddit AMAs

AMA = Ask Me (Us) Anything