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Understanding Galaxies

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Questions and Answers

What is a galaxy?

A cluster of black holes and nebulae

A collection of comets and asteroids

A group of planets held together by gravity

A large group of stars bound together by gravity (correct)

How many stars are estimated to be in our galaxy?

400 billion stars

200 billion stars (correct)

100 billion stars

300 billion stars

What is a protogalaxy?

A galaxy with an elliptical shape, almost void of dust

A galaxy with a spiral shape and arms wrapped around a center

A galaxy with no specific shape, mostly cloud-like

A galaxy believed to have originated from collisions between older galaxies (correct)

Why can't the center of the Milky Way be seen clearly?

The center is obscured by the large quantities of gas and dust in the spiral arms Signup and view all the answers

How old is the Earth according to the passage?

4.6 billion years Signup and view all the answers

What was the initial land that formed Earth made of?

Molten matter Signup and view all the answers

What does the passage compare the expansion of the universe to?

A stone hitting water and creating waves Signup and view all the answers

When did the Big Bang occur, according to the passage?

13.7 billion years ago Signup and view all the answers

What is believed to have caused the appearance of oxygen in the atmosphere?

Photosynthesis processes carried out by autotrophic organisms Signup and view all the answers

What were the initial components of the primitive atmosphere on Earth?

Nitrogen, water vapor, sulfur gases, and carbon Signup and view all the answers