On nights with little to no ambient light from the moon, a ghostly glow shaped like a hazy pyramid of light can be seen for a ...

Or does the star merely look reddish, since its light has had to travel through a cloud of cosmic dust to reach our telescope? For accurate observations, astronomers need to know the amount of ...

The black hole examined by the team is no small cosmic object. It is more than a billion times the mass of our Sun. Despite ...