Saturn🪐🔭
Saturn is primarily composed of these two elements, which are also the most abundant elements in the universe.
What are hydrogen and helium?
The Martian atmosphere is primarily composed of this gas, making up about 95% of it.
What is carbon dioxide?
Unlike most planets in the solar system, Venus rotates in this direction.
What is retrograde (or clockwise)?
This is the largest moon of Neptune, known for its retrograde orbit.
What is Triton?
Pluto has five known moons, with this being the largest.
What is Charon?
This scientist first observed Saturn's rings in 1610.
Who is Galileo Galilei?
The largest volcano in the solar system, located on Mars, is named this.
What is Olympus Mons?
This Soviet spacecraft became the first to successfully transmit data from the surface of Venus in 1970.
What is Venera 7?
This is the name of the largest storm ever observed on Neptune, comparable to Jupiter's Great Red Spot.
What is the Great Dark Spot?
This NASA spacecraft performed a historic flyby of Pluto in 2015, capturing detailed images.
What is New Horizons?
This icy moon of Saturn has geysers that eject water vapor and ice particles into space.
What is Enceladus?
This is the largest known impact crater on Mars, stretching over 2,000 kilometers in diameter.
What is the Hellas Basin or Hellas Planitia?
Venus has a very slow rotation period, taking about this many Earth days to complete one rotation.
What is 243 days?
This NASA spacecraft is the only one to have visited Neptune, in 1989.
What is Voyager 2?
This is a heart-shaped feature on Pluto that is partially submerged in large, bright glaciers of nitrogen ice.
What is Sputnik Planitia?
One season on Saturn, such as summer or winter, lasts about this many Earth years.
What is 7.5 years?
Mars has two small moons, Phobos and this other moon named after the Greek word for fear.
What is Deimos?
This is the largest volcanic structure on Venus, stretching over 500 kilometers in diameter.
What is Maat Mons?
Neptune completes one rotation on its axis in about this many hours.
What is 16 hours?
The International Astronomical Union reclassified Pluto as a dwarf planet in this year.
What is 2006?
This NASA spacecraft, launched in 1997, spent 13 years studying Saturn and its system.
What is Cassini?
This enormous canyon system on Mars is over 4,000 kilometers long and up to 7 kilometers deep.
What is Valles Marineris?
This mountain range on Venus is the only surface feature on the planet named after a man.
What is Maxwell Montes?
Neptune takes this many Earth years to complete one orbit around the Sun.
What is 165 years?
Pluto's surface temperature is extremely cold, averaging around this many degrees Fahrenheit.
What is -375 degrees Fahrenheit?