Earth has mini-Moon! But it’s temporary. Will the universe expand forever? Can something come from nothing?

Earth has mini-Moon! But it’s temporary. Will the universe expand forever? Can something come from nothing?
Divining Arrokoth’s secrets. How can we spread life in the galaxy? What happened in the early universe?
Plumes on Enceladus! Discussion with Dr. Christopher Glein. And of course we have more news roundup as well. Check it out at #365DaysOfAstro
This week we wonder if the Universe is going to collapse and then expand again, how satellites can have such different velocities, and the size of the observable Universe.
Healthy oceans are essential to our survival. They help to feed us, clean the water we drink, and most importantly, the oceans provide most of the oxygen we breathe — they are the lungs of our planet.