Read the passage. Then answer the question.
Stars provide light to the planets that orbit them. Yet there's a cosmic twist. These stars can run out of hydrogen in their core. It happens over time. This causes them to expand and become red giants. As red giants grow, they swallow the planets closest to them.
Scientists call this planetary engulfment. And they think it's pretty common. Ready to book a flight to Mars? Hold off. There's still a lot to learn about this phenomenon. Still nervous? This might help: Earth's sun has plenty of hydrogen in its core. It should keep shining as is for another 5 billion years.
Which three details would be most important in a summary of this paragraph?
Some people are interested in taking a trip to Mars one day.
Scientists are still learning how planetary engulfment works.
There are things that scientists are still learning about the universe.
Stars expand over time as they run out of hydrogen in their core.
Red giants sometimes swallow the planets closest to them.
- Stars can expand into red giants as they run out of hydrogen in their core
- Scientists are still learning about planetary engulfment
- Earth's sun has plenty of hydrogen in its core and should continue shining for another 5 billion years