The video explores the Milky Way, a spiral galaxy containing our solar system. It describes the galaxy's structure, including the bulge, disk, and halo, and explains its vast size and the number of stars and planets it contains. The video also discusses the local group of galaxies and the diversity of galaxy shapes. Historical observations by Galileo are highlighted, showing how the Milky Way was understood over time.

What did ancient peoples think the Milky Way looked like?

• A stream of milk

• A path of fire

• A line of clouds

• A river of stars

What holds galaxies together?

• Dark matter

• Magnetism

• Electricity

• Gravity

Tags

NGSS.MS-ESS1-2

NGSS.MS-PS2-4

Approximately how many stars are in the Milky Way?

• 2 trillion

• 200 billion

• 2 billion

• 200 million

Tags

NGSS.MS-ESS1-2

NGSS.MS-ESS1-3

What is the local group?

• A collection of galaxies

• A collection of black holes

• A collection of stars

• A collection of planets

Tags

NGSS.MS-ESS1-2

What shape is the Milky Way galaxy?

• Irregular

• Spiral

• Spherical

• Elliptical

What is at the very center of the Milky Way?

• A giant star

• A nebula

• A cluster of planets

• A black hole

Where is our solar system located in the Milky Way?

• In one of the spiral arms

• In the bulge

• In the halo

• In the Galactic Center

What is the halo of the Milky Way?

• A spherical layer of old stars and star clusters

• A dense region of young stars

• A flat region of gas and dust

• A bright ring of light

Tags

NGSS.MS-ESS1-2

Who first suggested that the Milky Way might be made of far away stars?

• Albert Einstein

• Galileo Galilei

• Isaac Newton

• Ancient Greek philosophers

What did Galileo Galilei discover about the Milky Way?

• It is a spiral galaxy

• It is made of many faint stars

• It is part of the local group

• It contains a black hole