10 Questions
What is a galaxy?
A large group of stars bound together by gravity
How many stars are estimated to be in our galaxy?
200 billion stars
What is a protogalaxy?
A galaxy believed to have originated from collisions between older galaxies
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
How old is the Earth according to the passage?
4.6 billion years
What was the initial land that formed Earth made of?
Molten matter
What does the passage compare the expansion of the universe to?
A stone hitting water and creating waves
When did the Big Bang occur, according to the passage?
13.7 billion years ago
What is believed to have caused the appearance of oxygen in the atmosphere?
Photosynthesis processes carried out by autotrophic organisms
What were the initial components of the primitive atmosphere on Earth?
Nitrogen, water vapor, sulfur gases, and carbon
Explore the characteristics of galaxies, including their size, composition, and different shapes. Learn about the estimated number of stars in our galaxy and the vastness of the universe.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
