Astronomy on MSN15h
Does a comet’s period change because it loses mass every time it nears the Sun?
Because the period of an object does not depend on its mass, comets’ orbital periods remain unchanged due to mass loss.
New Scientist on MSN14h
How to see all the solar system’s planets in the night sky at once
All seven of the other planets in our solar system are about to become visible at once in a great planetary alignment – ...