What would happen if planets collided at a snail's pace? How much of Avengers Endgame regarding time is scientifically acceptable? Why aren't stars closer together? And the team discuss a listener's theory to terra-form Mars.
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And keep adding to The Supermassive Mailbox with your pictures and questions for the team. Send them to podcast@ras.ac.uk or follow them on Instagram, @SupermassivePod.
The Supermassive Podcast is a Boffin Media production for the Royal Astronomical Society. The producers are Izzie Clarke and Richard Hollingham.
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