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How many planets are there in our solar system?CorrectIncorrect
In 2007, Voyager 2 crossed the heliosheath boundary and into the vast region at the edge of our solar system where the solar wind runs up against the thin gas between the stars. What did this crossing confirm about the shape of our solar system?
- It’s squashed
- It’s round
- It’s a horseshoe shape
- It’s like a donut
Match the following:
- 220km in a second
- 5 billion years
- Venus is 96% Carbon dioxide and 4% nitrogen. For the other planets – Mercury doesn’t really have an atmosphere; Earth is 78% nitrogen and 21% oxygen; and Saturn is 19% helium and the rest hydrogen.
- It takes the Sun 225-250 million years to do one revolution of the Milky Way Galaxy. How fast does the Sun travel?
- How old is the solar system
- Which statement describes the atmosphere of the planet correctly?