Question

Can I have this question corrected. Please edit if you think of better responses.. thank you!

(i) Briefly describe two types of observations that support the existence of dark matter.

Warping of spacetime due to presence of invisible matter. (Gravitational lensing)

Observing flat rotation curve of galaxy

(ii) What are two differences between dark matter and dark energy?

DE makes up approximately 70% of universe whereas DM 25%

DE causes universe to expand whereas DM just exisits and does not interact with other matter.

(iii) What would happen to the expansion rate of the Universe if there were no dark energy?

I'm not sure..,

Answer 1