Replay Tuesday's chat for facts, photos and your questions answered by experts.
Your help is needed to explore Mars like never before for the latest Zooniverse project.
Follow @BBCStargazingNews, event details and behind-the-scene photos from the Stargazing LIVE production team.
Follow @BBCStargazing on Twitter
Why is Mars so hostile?Like Earth it's a rocky planet with polar ice caps and seasons, so why does the Red Planet seem so lifeless?
Things To Do: Stargazing
BBC Things To Do is a website which helps you find events in the UK for people of all ages. The events are all run by the BBC and trusted partners.
Sir Patrick Moore 1923-2012
Astronomy through social media
Web producer Simon Mackie writes about life on location for the Stargazing web team, and how they use Twitter, Flickr, live web chats and citizen science to engage with the audience at home.
- Brian Cox
- Dara O Briain
- Liz Bonnin
- Series Producer
- Alan Holland
- Executive Producer
- Helen Thomas