Science Buddies: "Ask an Expert"

this is my idea, please read and tell me how is it (sorry for my English): Dark matter, it makes the universe expanding. Gravity make matters closer, gravity is made of every massive object. and dark matter make galaxies expanding, so i think dark matter is a kind of matter has massive smaller than 0, massive > 0 make gravity and make thing move closer, massive < 0 make "antigravity" and make things expanding. Dark matter every where in universe, make everything expanding. Right?

Hello Lemonew,

Are you doing a science project on space exploration? If so, please tell us your hypotheses and how you plan to set up your experiment. This project guide will help you:

https://www.sciencebuddies.org/science- ... ndex.shtml

If you are doing a science project, let us know if you have more questions.