How old is that star? That planet? That nebula? Figuring out the ages of astronomical objects is surprisingly challenging. Fortunately, astronomers have developed a series of techniques they can use to work out the ages of stuff.

Today we have story about Steward Observatory's Mountain Lemmon Operations that helps Catalina Sky Survey to discover many asteroids. Also about 11 close approaches by asteroids larger than 300 feet in diameter.

The Event Horizon Telescope (EHT) Collaboration has unveiled the first image of the supermassive black hole at the centre of our own Milky Way galaxy! More about it with @cosmicsavannah at #365DaysOfAstro

The Hunga Tonga-Hunga Ha’apai volcano in the Kingdom of Tonga erupted and despite communications being cut off scientists have gathered a wealth of information about the event and its outcome. More about it at #365DaysOfAstro

If you’ve never been to the southern hemisphere, you might not be aware that the moon and the constellations appear upside down!In this episode we’ll show you how that appears, why, and how that proves the Earth isn’t flat - as if any more proof were needed!

Today we have SETI Artist in Residence Program Director Bettina Forget discussion with Emma Nordin from Art21, premieres Xin Liu's video, and then speaks with her about this latest show and its scientific concepts.