Galaxies and Light Years

An Astronomical Unit (AU) is the distance from the sun to the earth. Why can't we use AUs to measure the distance between stars?

• Because we created lightyears first

• Because the number would be too large to be manageable

• Scientist do use AUs to measure the distance between stars

• Because AUs aren't considered a reliable type of measurement

What is the most appropriate measurement to use to measure the distance between stars?

• Meters

• Miles

• Astronomical Units

• Light years

What is the best measurement to use when measuring the distance between galaxies?

• Astronomical Units

• Kilometers

• Light years

• Miles

What is a light year?

• The speed at which light travels

• How far light travels in one year

• The distance from the sun to the Earth

• The distance between the sun and Proxima Centauri

What type of galaxy is The Milky Way?

• Irregular

• Elliptical

• Spiral

• Oblong

What type of galaxy contains mostly old stars?

• Spiral

• Elliptical

• Irregular

• Peculiar

What type of galaxy is shown here?

• Spiral

• Elliptical

• Irregular

• Spherical

Tags

NGSS.MS-ESS1-2

What type of galaxy is shown here?

• Spiral

• Elliptical

• Spherical

• Irregular

Tags

NGSS.MS-ESS1-2

Where are the oldest stars found in a spiral galaxy?

• In the arms

• Near the center

• Spread evenly throughout

• No new stars form, they are all the same age

How are irregular galaxies formed?

• Due to differences in masses of stars

• Due to the gravitational pull of black holes

• Due to galactic collisions

• Due to the Big Bang