8 Topic 4: The Universe

What are some characteristics of this type of galaxy?

Choose two correct answers.

• Bulge in the center that arms come off of.

• Looks stretched out without arms.

• Does not have a regular shape

• Has a lot of old stars

• The arms have dust and gas

Tags

NGSS.MS-ESS1-2

A collection of gas and dust...

• supergiant

• star just starting to form

• main sequence

• black hole

What is the characteristics of a spiral galaxy?

• rounded oval shape

• no regular shape

• a concentrated bulge of matter in the middle and arms

What is the characteristics of a elliptical galaxy?

• rounded oval shape

• no regular shape

• a concentrated bulge of matter in the middle and arms

What is the characteristics of a irregular galaxy?

• rounded oval shape

• no regular shape

• a concentrated bulge of matter in the middle and arms

The Hertzsprung-Russell Diagram shows the relationship between a star's temperature and its luminosity.

Which of the following stars is a hot and dim star?

• Sirius B

• Barnard’s Star

• Mira

• Altair

Which of the following stars is a bright and hot star?

• Barnard’s Star

• Rigel

• Sun

• RW Cephei

Tags

NGSS.HS-ESS1-1

What does the Big Bang Theory explain?

• How Earth is expanding

• How space is becoming a black hole

• How the moon and the stars are colliding

• How the universe was formed

Tags

NGSS.HS-ESS1-2

In a star’s life, what is protostar?

• formed right after a nebula containing gas and dust collapses

• a cloud of dust and gas

• formed right after a main sequence star collapses

• formed right after a supernova

Sirius B is a small and dense star that used to be much larger and shone a bright blue. Now, it is so dense that even though it is smaller than our sun, it contains the same amount of mass as our sun. Sirius B was the first star of its kind to be discovered. What type of star is Sirius B currently?

• Protostar

• Supergiant

• White dwarf

• Nebula