I have been absent from this blog for a while, but I have not been idle. In addition to writing the Ask an Astronomer column for Astronomy Now magazine, I have been answering questions for Astronomy Magazine’s “Ask Astro” column. Check out a few of my answers below, or submit your own question to “Ask Astro” here.
How is the Moon 1% of Earth’s mass, but its gravity is 17% of Earth’s?
How long do planetary nebulae last?
Why are craters perfectly round even though meteorites are irregularly shaped?
What does the term ‘supersonic’ mean in astronomy?
What happens if Earth stops rotating?
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