Space

1. Planets

1.1. There are many planets including :Mercury, Venus, Earth, Mars , Jupiter, Saturn, Uranus and Neptune

2. Black holes

2.1. Black holes are not actually black, it is just that there suction is so strong that it sucks out all of the light. Black holes are also invisible. You can make black hole on earth with the Hadron Collider which slams things together to make a black hole for a split second. Black holes emit radiation. Because they emit radiation they shrink, that’s why they always eat.