Question

1.)What is the difference between the different types of star clusters?

2.) Summarize the characteristics of a dwarf galaxy.

3.)Name at least three properties of stars revealed by special characteristics:

4.) How do scientists know dark energy exists?

5.)What observations and reasoning led to the development of Hubble's Law?

6.) What was the foundation of Georges Lema^itre's Big Bang Theory?​

Answer 1

Not too sure on 3,5, and 6, but here's the other three.

1. The three types of star clusters differ in size and location. Globular clusters are the largest, and are located in a halo around a galaxy. Open clusters are the second largest, only containing hundreds of stars rather than the hundreds of thousands in globular clusters. They're found in the plane of the galaxy. The smallest are associations, which contain extremely young stars and can be found in gas and dust regions of the galaxy.

2. Dwarf galaxies lack evidence of recent star formation, contain little to no gas, and are elliptical.

4. We can't observe dark energy, however, we can observe its effect on other observable things. For instance, there is a galaxy that when we observe it, we see it five times. As in, it appears that we are seeing five different galaxies, but it's just the one. This happens because the light being produced from the galaxy is warped by immense gravity.

[credit to twitch user ElectriCandy for answering this during my stream. <3]