Solar System Online Test

1. Which spacecraft was the first to visit Mercury?

2. What is the heliosphere?

3. Which space probe was the first to fly by Jupiter and Saturn and provided close-up images of their moons, including Io's volcanic activity?

4. According to Kepler's first law of planetary motion, what shape do planetary orbits trace around the Sun?

5. What is the name of the spacecraft that became the first human-made object to reach interstellar space in 2012?

6. What is the name of the phase of the Moon when it is fully illuminated as seen from Earth?

7. Which space probe was the first to fly by Jupiter, Saturn, Uranus, and Neptune, providing detailed data on these gas giants and their moons?

8. What is tidal locking?

9. What was the approximate length of the tail of Comet Hale-Bopp during its peak brightness in 1997?

10. Which moon of Saturn exhibits extensive cryovolcanism, with geysers erupting from its south polar region?

11. What effect does tidal heating have on celestial bodies?

12. Which space probe was the first to visit the asteroid belt and to make direct observations of Jupiter?

13. What is the name of the large, dark plains on the Moon's surface, formed by ancient volcanic eruptions?

14. Which mission is currently orbiting Mercury to study its surface and composition?

15. Which surface feature on Venus is a vast, elevated region similar to continents on Earth?

16. What is the name of the volcanic moon of Jupiter known for its intense volcanic activity?

17. Which mission provided the first detailed radar maps of Venus's surface?

18. What is the region called where the solar wind slows down and merges with the interstellar medium?

19. Which moon of Uranus is known for its heavily cratered surface and bright, icy terrain?

20. Which moon of Neptune is the largest and seventh-largest moon in the solar system?

21. What is the primary greenhouse gas in Earth's atmosphere?

22. What geological feature on Mars is believed to be the largest volcano in the Solar System by volume and is named after the Roman god of war?

23. What is the Earth's mantle primarily composed of?

24. Which layer of the Earth's atmosphere is closest to the planet's surface?

25. Which moon of Jupiter was discovered by Galileo Galilei in 1610, making it one of the first objects observed in orbit around another planet?

26. Which moon of Neptune is thought to be a captured Kuiper Belt object, based on its retrograde orbit and unique composition?

27. Which layer of the Earth's atmosphere contains most of the weather phenomena?

28. What is the name of the moon of Pluto discovered in 2011 and named after the three-headed dog that guards the entrance to the underworld in Greek mythology?

29. Which of the following is NOT a greenhouse gas?

30. Which spacecraft provided the first close-up images and data of Uranus and its moons?