Unit 2 lesson 3 the universe!

Front

What galaxy is Earth and the solar system located in?

Back

The Milky Way galaxy.

Front

What evidence supports the location of the sun in the galaxy?

Back

Observation of globular clusters.

Front

If two stars appear equally bright in the night sky, what additional information could help identify their distances from Earth?

Back

The sizes of the stars.

Front

What characteristic of the Milky Way galaxy was evidenced by the measurements of relative brightness by William and Caroline Herschel?

Back

The shape of the Milky Way galaxy.

Front

What unit is used to measure large distances in the universe?

Back

Light years.

Front

How are large distances in the universe expressed?

Back

By orders of magnitude.

Front

What is a globular cluster?

Back

A spherical collection of stars that orbits a galactic core.

Front

What is the significance of measuring the brightness of stars?

Back

It helps determine their distances and characteristics.

Front

What is the difference between apparent brightness and absolute brightness?

Back

Apparent brightness is how bright a star appears from Earth, while absolute brightness is the intrinsic brightness of a star at a standard distance.

Front

What is the role of parallax in measuring distances to stars?

Back

Parallax is the apparent shift in position of a nearby star against distant background stars, used to calculate its distance.