There's a lot we don't know about our own solar system. Signs are there could be a very large planet about a million light years from Earth, but still orbiting our star.

The latest trend is to send thousands of very small satellites into low earth orbit, which have a short life. These then burn up on re-entry into Earth's atmosphere after a few months of operation. There is predicted to be a couple of tons of satellite debris entering the atmosphere every day. As they are made of aluminium, in sufficient quantities this could cause serious environmental problems.

Lots going on in space flight at the moment: the Chinese space station is being constructed in space with the second robotic cargo launch having been successfully completed; something made a hole in the International Space Station's robotic arm; SpaceX made a 10th launch and re-landing of its reusable booster rocket, and the Mars rover Perseverance's helicopter survived what could have been a serious problem.

Professor David Buckley of the South African Astronomical Observatory talks to Kechil about the latest weird findings from outer space. Periodic X-ray flares from the centre of far away galaxies is having scientists wondering what is causing them - perhaps two black holes whizzing around each other? We just don't know.

Associate Professor Emeritus John S Compton has produced a new book about the West Coast called "The West Coast, A Natural History" and his particular view of the ecology of this area has been influenced and inspired by his life as a geologist. Geology is interesting to some branches of astronomers, particularly those who study exoplanets and astrobiologists, who study the possibilities of life on other planets. You can obtain his book and others from his website http://www.johnscompton.com/ or small bookshops such as The Book Lounge or from Kirstenbosch Gardens. He is giving a talk to the local astronomy society about geology which the public is welcome to join via zoom at 19:30 on Wednesday 26 May. This is the code for those interested: https://us02web.zoom.us/j/84770804350?pwd=K3hRaVdEei9vL3p3dHNBTFV5MjRkdz09

Anti-matter is a strange concept and apparently exists in space somewhere. Scientists are looking for it, and if it is detected it could offer clues as to how the Universe was born.

Would you like to swing on a star? Space tourism is finally taking off. Place your bids with Blue Origins and you too could spend a lot of money to peer out at space from a capsule, for a few minutes, before parachuting down to Earth.

Satellites are used to detect fires, and here to tell us about the South African Advanced Fire Information System is engineer from the CSIR, Riaan van den Dool.

This last week Table Mountain went up in flames, causing terrible damage, displacing people and destroying the lives of countless creatures and plants. But what is fire and how is terrestrial fire different to what we see in our Sun? Here to talk us through the physics (gently) is Dr Richard Armstrong, an astronomer at the South African Radio Astronomy Observatory.

It's 60 years since Yuri Gagarin orbited planet Earth, and in that time we have learnt how to examine the atmospheres around exoplanets orbiting distant stars. What about our closest star and the planets around that? And what will the next 60 years of space exploration bring?