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?

The Solar System Has a Lot of Water

There have been a couple of recent discoveries of water in new places in the solar system. Last week a team using data from India’s Chandrayaan-1 probe announced the discovery of water ice on the surface of the Moon, and last month researchers using radar data from the European Space Agency’s Mars Express mission announced… Continue reading The Solar System Has a Lot of Water

How long have we been predicting eclipses?

Tomorrow there will be a total lunar eclipse which will be visible in much of North America and Asia. I won’t personally be able to watch it from here in the UK, but if you’ve never seen one you should check it out if you can. During a lunar eclipse the Earth moves directly between… Continue reading How long have we been predicting eclipses?