Solar System Overview

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10 Questions

Which type of planets are primarily made of helium and hydrogen?

Gas giants

Among the terrestrial planets, which planet is the hottest?

Venus

Which planet in our solar system is the smallest and closest to the sun?

Mercury

Which planet in our solar system is famous for its rings?

Saturn

What is the common composition of ice giants like Uranus and Neptune?

Water, methane, and ammonia

Which planets in our solar system are known as Jovian planets?

Jupiter, Saturn, Uranus, Neptune

What percentage of stars in the galaxy have planetary systems?

15%

Which star cluster in the Milky Way galaxy houses our solar system?

Orion star cluster

How many known solar systems are there in the Milky Way galaxy?

Over 500 solar systems

What caused the formation of our solar system about 4.5 billion years ago?

Collapse of a cloud of interstellar gas and dust into a solar nebula

Study Notes

  • Our solar system is one of over 500 known solar systems in the Milky Way galaxy.
  • The solar system came into being about 4.5 billion years ago, following the collapse of a cloud of interstellar gas and dust into a solar nebula.
  • The solar system is located in the Milky Way's Orion star cluster.
  • Only 15% of stars in the galaxy have planetary systems, with our sun being one of them.
  • The solar system consists of eight planets.
  • The first four planets, Mercury, Venus, Earth, and Mars, are called Terrestrial planets, primarily made of rocky material with solid surfaces and no ring systems.
  • Mercury is the smallest and closest to the sun, having the shortest orbit.
  • Venus is the hottest planet with temperatures reaching up to 867 degrees Fahrenheit.
  • Earth is the only known planet to sustain life.
  • Mars might have supported life about 3.7 billion years ago when it had a watery surface and moist atmosphere.
  • The last four planets, Jupiter, Saturn, Uranus, and Neptune, are called Jovian planets, predominantly made of helium and hydrogen.
  • Jupiter and Saturn are gas giants with multiple moons, ring systems, and no solid surface.
  • Uranus and Neptune are ice giants with rock, ice, and a liquid mixture of water, methane, and ammonia.
  • All Jovian planets have multiple moons, ring systems, and are immense.
  • Jupiter is the largest planet in the solar system.
  • Saturn is famous for its rings, which are wide enough to fit between Earth and the moon but are barely a kilometer thick.
  • Uranus is the seventh planet and is famous for rotating on its side.
  • Neptune is the eighth and outermost planet and is also one of the coldest.
  • The asteroid belt, a flat disc of rocky objects, orbits the Terrestrial planets.
  • The Kuiper Belt, a disc of space debris, orbits the Jovian planets and is home to dwarf planets and the birthplace of many comets.
  • The Oort Cloud, a vast, spherical collection of icy debris, is considered the edge of the solar system.

Explore interesting facts about our solar system, including the formation, composition, and characteristics of its planets and other celestial bodies. Learn about the Terrestrial and Jovian planets, asteroid belt, Kuiper Belt, and Oort Cloud.

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