Ask An Astronomer Answer Archives
- How can the stars in our Galaxy be older than the Universe?
- All other galaxies in the Universe are moving away from the Milky Way; does that mean we are at the center of the expanding universe?
- Will the universe collapse some day?
- What was Herschel's theory about the structure of the universe?
- What is outside the universe?
- I have questions about the Big Bang and relativity.
- Why are the spins of galaxies randomly oriented?
- If space is expanding, is the space within a galaxy expanding as well?
- If you travel faster than the speed of light, can you go back in time?