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Mercury is innermost and smallest planet of the Solar System.
Mercury, Solar System, inner planets, rocky planet, Sun, planet, astronomy, geography
The inner planets of the Solar System are terrestrial planets while the outer planets are gas giants.
The formation of the Sun and the planets started with the contraction of a dust cloud about 4.5 billion years ago.
The Earth is a rocky planet with a solid crust and oxygen in its atmosphere.
Jupiter is the largest planet of the Solar System, it has two and a half times the mass of all the other planets combined.
The three important laws describing planetary motion were formulated by Johannes Kepler.
Possible traces of water and life are sought on Mars.
Space probes and Mars rovers examine the structure of Mars and possible traces of life.
The diameter of our galaxy is about 100,000 light years; it contains more than 100 billion stars, one of which is our Sun.
Neptune is the outermost planet of the Solar System, the smallest of the giant planets
The largest satellite of Pluto is Charon.
Saturn is the second largest planet in the Solar System, easily recognisable by its rings.
The Cassini spacecraft was exploring Saturn and its moons for nearly 20 years.
Studying Ceres and Vesta will help us learn more about the early history of the Solar System and how rocky planets are formed.
The New Horizons space probe was launched in 2006, with the objective to study Pluto and the Kuiper Belt.
The orbits of the 8 planets in our Solar System are elliptical.
The Earth is composed of several spherical layers.
The diameter of the Sun is about 109 times that of the Earth. Most of its mass consists of hydrogen.
Uranus is the 7th planet from the Sun, a gas giant.
Venus is the 2nd planet from the Sun, the brightest object on the night sky (after the Moon).