What the bloomin’ hell is a Gravastar? Are fast radio bursts like solar flares on steroids? Plus an interesting question on multiverses that can't be summed up in a short sentence. Izzie Clarke, Dr Becky Smethurst and Dr Robert Massey dive into The Supermassive Mailbox and take on your questions.

Keep sending in your wonderful ponderings. Email them to podcast@ras.ac.uk or via Instagram @Supermassivepod

The Supermassive Podcast is a Boffin Media production. The producers are Izzie Clarke and Richard Hollingham.

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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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BONUS - Can we gravitationally "hitch hike" out of the Solar System?