Astronomy with Grant Christie
This week Graeme Hill is back for Weekend Variety Wireless, as it continues with Astronomy Today and Grant Kristie.
They discuss the dances of stars at the centre of the Milky Way and a very watery Mars.
Listen to the audio with Grant Kristie above.
Weekend Variety Wireless with Graeme Hill, 8pm - midnight on RadioLIVE and streaming live to the Rova app on Android and iPhone.
Guess the weight, win the tyres!
There's a set of GT 4x4 tyres to be won, just tell us how much you think this big tyre weighs!