Think of Mercury as a metal ball a bit larger than our Moon, with a rocky crust on top. more about Mercury at #365DaysOfAstro with @blackrockcastle
The Fermi Paradox: Given the size and age of the universe there should be extra terrestrial life but how come we can find no sign of it.
Here’s a story about Pallas.
Bayer names, Flamsteed numbers and the Henry Draper catalogue – how to name falling star.
Daily sunspot records have been kept by most major observatories since the mid-1800s and there are records going back thousands of years of these dark areas on the Sun’s face.