All the planets in the Solar System revolve in a clockwise motion.

​Which space mission orbited Saturn and dropped a probe into Saturn’s atmosphere?

​ Kuiper belt objects appear to be ancient planetesimals that formed in the outer Solar System but were never incorporated into a planet.

​Scientists believe Saturn’s moon Phoebe originated from a ____.

​The Babcock model of the solar magnetic cycle explains the sunspot cycle as primarily a consequence of the Sun’s ____.

​Mercury is still geologically active today.

During which stage of planetary development did the lunar maria form?​

​Which method does the Kepler space telescope use to detect extrasolar planets?

Which characteristic of Venus has led many to call it the “sister planet” to Earth?​

Which is the correct order of planetary object class during their formation?​