| Text | Actions |
|---|---|
| What factors determine the boundaries of the **habitable zone** around a star? | Edit |
| What additional factors are necessary for a planet to support **life** as we know it? _(Select all that apply)_ | Edit |
| Which of the following planets is most likely to support **life** as we know it? | Edit |
| Which of the following would be the strongest evidence for **life** on an exoplanet? | Edit |