Space, including its content, is called the _____.
universe
What is the nearest star to earth?
sun
How many Earths are required to fit across the sun's disk?
109
The study of the universe is called _____.
Astronomy
How many million Earths can fit inside the sun?
1.3
The surface of the sun is called the _____.
photosphere
_____ are darker, cooler areas on the sun's photosphere.
sunspots
What are bursts of energy called?
flares
Larger eruptions are called _____.
prominences
The outer layer of the sun's atmosphere is the _____.
corona
Which is the center of our galaxy?
Milky Way
The sun plays an essential role in the formation of _____.
vitamin D
