How do we know when something is from outside the Solar System?

You probably saw the recent news that astronomers have spotted an object from interstellar space making its way through the Solar System. It’s called 2I/Borisov and it’s the second object like this that we’ve seen. The first was called 1I/’Oumuamua and was only spotted a couple of years ago, so this is all very new… Continue reading How do we know when something is from outside the Solar System?

Why astronomers are excited about repeating fast radio bursts

The CHIME telescope in Canada recently detected eight new repeating fast radio bursts. This is huge news! It brings the total number of known repeating fast radio burst sources to ten, up from the two which were previously known. Fast radio bursts are one of the biggest and most interesting mysteries in astrophysics today. First… Continue reading Why astronomers are excited about repeating fast radio bursts