It's one of the biggest ever — roughly 30 billion times the mass of our sun. It's the first to be found using gravitational lensing. That's when a nearby galaxy acts like a giant magnifying glass.
There's no need for a telescope to see the five planets — Mercury, Jupiter, Venus, Uranus and Mars — that will line up near the moon. You haven't until Friday to see it for yourself.
Over the next couple of nights, five planets are expected to align in the sky. And you won't even need a telescope to see them (although binoculars will help).
A strange comet-like object discovered over five years ago was the first known visitor from another solar system. Its movement was so odd that scientists struggled to explain it, until now.