Ask an Astronomer Team

Sean Marshall

Sean graduated from Cornell with a Ph.D. in Astronomy in 2017, where he worked with Professor Donald Campbell to study physical properties of near-Earth asteroids using radar and infrared data. 

Display # 
Title Created Date Hits
Why is Neptune still considered a planet when Pluto crosses its orbit? (Intermediate) Jul 15 171257
Could there be objects orbiting interior to Mercury? (Intermediate) Jul 15 109064
Have the inner planets cleared their neighborhood? (Intermediate) Jul 15 92464
Can the Sun be closer to the Earth than any planet is to Earth? (Intermediate) Sep 12 53967

Share This Page

Share This

Random Question

Most Recent

Editor's Pick

Most Popular


Our Reddit AMAs

AMA = Ask Me (Us) Anything

Q&A Categories