comet:a object that has 2 tails,is white and travel really fast Astronaut:Somebody who is in space and explores planets in a suit Astronomer:Somebody who studys planets and space asteroid:A object that escaped the orbit of saturn, it can cause extinction (dinosaurs)
Space:A big infinite place that is above earth Planet-A sphere-like object in space that is made out land,water,and gasses
Dwarf Planet-A planet that is to small for a planet and to big for a asteroid
Gravity-A force made by for core of planets,It pulls stuff down
Galaxy-A thing that is also a Universe,It has more than 1 Septillion planets!
Light Year-When you travel the speed of light,That is 1 year of traveling the speed of light without stoping