- 1- How big is the Solar System? Why?
- 2- What is the shape of the Solar System? Why?
- 3- Give 5 differences between the terrestrial and the giant planets. Explain each of them.
- 4- A US spacecraft named OSIRIS-Rex traveled more than 200 million miles from Earth just to collect a handful of rocks from one asteroid.
- a) Was this the first time a spacecraft grabbed a sample from an asteroid? Explainyour answer.
- b) Why was this one an important mission? Give at least two main reasons.
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