As part of their discussion, the team reveal how studying these objects can unveil information about the origins of life on Earth.
Meanwhile, Liz Bonnin meets the NASA team tasked with tracking any space objects on a collision course with Earth.
The results of the experiment carried out by the Stargazing viewers - to explore an uncharted area on the surface of Mars - are also revealed.
Visit our Stargazing LIVE hub to order a free Star Guide, watch animated videos, play with planetary interactives and more. See content relevant to this episode below...
Recognising a Meteorite
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The essential guide to comets
Dave Rothery explains (almost) everything you need to know about comets in this essential guide. Read more: The essential guide to comets
A Brief History of Asteroid Spotting
Professor David W Hughes explores the history of the search for asteroids Read more: A Brief History of Asteroid Spotting
