Moon and Inner Planets

1. If we stand on Mercury's surface, the Sun would appear ___ larger.
5. The four ___ are a result of Earth's axis of rotation being tilted.
7. Mars' smaller irregular moon.
9. Soviet spacecraft that survived Venus' dense atmosphere and took a picture of its surface.
11. Olympus Mons is a ___ volcano.
13. Spacecraft currently orbiting Mercury.
15. First mission to Venus that sent information with a flyby.
16. ___ observations help study the weather, drought and other phenomena that affects the environment, economy, and society.
18. Canyon tha tstretches 4,000 km along the equator of Mars.
20. The Earth is not a perfect sphere, but a ___ ___.
23. Venus is a rocky planet, known as ___.
24. Mars' larger irregular moon.
25. Mercury is smaller than Jupiter's moon.
28. The surface of Venus has few craters due to the constant ___ reshaping the surface.
30. When looking through a telescope, you can see that Venus goes through ____ like the Moon.

2. Many cultures focused on Mars' ___ color.
3. The moon has a very thin and weak atmosphere, called ___.
4. Mars had the largest ___ storms in the solar system.
5. From Earth, we always see the same face because the moon is in ____ ____ with Earth.
6. Venus has ___ moon or rings.
8. NASA's ___ used radar to penetrate the clouds and map most of the planet's surface.
10. Mars is described as a '___ ___ ___.'
12. Nearly the entire moon is covered by a charcoal-gray, powdery dust and rocky debris called the ___ ___.
14. Considered to as "Earth's sister" or "Earth's twin."
17. The Earth's ___ includes the crust and upper mantle.
19. Earth is the only planet known to harbor ___.
21. It is often revered as the ___ or the "Evening Star."
22. Earth's atmosphere protects it from incoming ___.
26. Impact basins that were filled with lava billion of years ago.
27. Mars is about ___ half size of Earth, but twice the size of Moon.
29. The smallest and closest planet to the Sun.