Keeping up with the Joneses

Not even Dick Clark will live long enough to watch a single star evolve. So, to overcome the limitation of the human life span, remember that we can chart the development of a certain mass star by observing many similar stars in various stages of development. The same is true for galaxies. The Milky Way (at our radius) takes 225 million years to rotate once! We can sometimes look to galaxies similar to our own in order to gain the necessary perspective and make generalizations about the Milky Way.

The Andromeda galaxy (Messier Object 31) is about 2 million light-years distant, and is clearly visible with any decent telescope pointed toward its namesake constellation. Like the Milky Way, Andromeda is what we call a spiral galaxy, with distinct, bright, curved structures called spiral arms (we'll talk about different kinds of galactic shapes in the next chapter). The universe contains many spiral galaxies which astronomers can observe in order to study aspects of the Milky Way that are hidden by our location in it.

Telescopes Mastery

Telescopes Mastery

Through this ebook, you are going to learn what you will need to know all about the telescopes that can provide a fun and rewarding hobby for you and your family!

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