Planet Nine: kicked out by the moody young Solar System?

It’s official: there might be an extra planet in the Solar System.  It’s called Planet Nine.  Like Hansel, it’s so hot right now. To find it you must trek past Uranus and Neptune into the dark reaches of the Solar System.  It’s on an orbit hundreds of times larger than Earth’s, that takes 20,000 years … More Planet Nine: kicked out by the moody young Solar System?

Giraffes and planets

Giraffes are covered in patches.  The patches are brown and the space in between the patches is white.  Everyone knows this. Here is something you probably didn’t know: you can see those patches in infrared light.  In simple terms, infrared light measures heat (at least at the temperatures we are used to in everyday life).  … More Giraffes and planets