What is the age of the Milky Way

At the center of the milky way sits a supermassive black hole called

  In what year does Hubble study the Andromeda Nebula?

  It’s called a ________ because if you could view it from the top or bottom, it would look like a spinning pinwheel.

A large collection of stars, dust, and gas in space. A system of millions or billions of stars held together by gravity.      

Elliptical are preferentially found close to the centers of galaxy clusters. It ranges in size from tens of millions to over one hundred trillion stars.

He is a Dutch astronomer, sometimes dubbed the master of the galactic system, was the first to realize that the Milky Way isn't motionless but rotates, and he calculated speeds at which stars at various distances orbit around the galactic center.

Are stars whose brightness changes periodically over time, and they had been discovered by the American astronomer, Henrietta Leavitt, in the early 1900ʼs.

Which of the following is a characteristic of spiral galaxy/galaxies?

. Galaxies which have very little dust, are neither disk-like nor elliptical. Astronomers often see these galaxies as they peer deeply into the universe, which is equivalent to looking back in time.           

Give the 2 groups that divided under Spiral Galaxies

The following are major categories of galaxy except one:

In other part of the world, our galaxy goes by another name. In Kalahari Desert in Southern Africa, it is called ________.

In his paper, He plotted a graph of the velocity of galaxies (obtained from determining the redshift of the spectra of these galaxies) against their distances (from Cepheid variables).