What is the Sun made of?
Q: What is the Sun made of?
A: The Sun is composed of hydrogen and a small amount of helium.
Q: Where did the materials that make up planets and their satellites come from?
A: The materials that make up planets and their satellites came from earlier supernovae explosions.
Q: How does the atmosphere protect life on Earth?
A: The atmosphere protects life on Earth by absorbing ultraviolet rays from the Sun, making days cooler and nights warmer.
Q: What are solid particulates in relation to the atmosphere?
A: Solid particulates, such as ash, dust, volcanic ash, etc., are small parts of atmosphere which are important in making clouds and fog.
Q: Is there a clear border between the atmosphere and outer space?
A: No, there is no clear border between the atmosphere and outer space though the Kármán line is sometimes treated as a border. Even higher, for some purposes the edge of the magnetosphere is treated as a border.
Q: How much of Earth's atmosphere is within 11 kilometres (6.8 miles) of its surface?
A: 75% of Earth's atmosphere is within 11 kilometres (6.8 miles) of its surface.
Q: When was life on Earth believed to have begun?
A: Life on Earth began after an impact with an early Earth formed our Moon; therefore it began after this event occurred.
