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When the solar system settled into its current layout about 4.5 billion years ago, Mars formed when gravity pulled swirling gas and dust in to become the fourth planet from the Sun. Mars is about half the size of Earth, and like its fellow terrestrial planets, it has a central core, a rocky mantle, and a solid crust.
Mars usually appears distinctly yellow, orange, or red. When farthest away from Earth, it is more than seven times farther away than when it is closest. Mars is usually close enough for particularly good viewing once or twice at 15-year or 17-year intervals.
- 24.07 km/s, (86700 km/h; 53800 mph)
- 1.025957 d, 24ʰ 37ᵐ 22.7ˢ
- 241 m/s, (870 km/h; 540 mph)
How old is Mars? Mars was formed at the same time as the rest of the Solar System, from a large spinning disk of gas and dust. Astronomers think that all this happened about 4.6 billion years ago!
Mars is one of the most explored bodies in our solar system, and it's the only planet where we've sent rovers to explore the alien landscape. NASA missions have found lots of evidence that Mars was much wetter and warmer, with a thicker atmosphere, billions of years ago. Explore with Us
When the solar system settled into its current layout about 4.5 billion years ago, Mars formed when gravity pulled swirling gas and dust in to become the fourth planet from the Sun. Mars is about half the size of Earth, and like its fellow terrestrial planets, it has a central core, a rocky mantle, and a solid crust.
1 set 2019 · Mars has been a world of two halves ever since – the rugged southern highlands and the flat northern plains. At the beginning of this period, the initial very dense atmosphere, which formed as a result of asteroid or comet impacts and outgassing of the planet's mantle, started to cool down.
Our current best estimate is that this happened around 4.6 billion years ago, which means that Mars is that old. In other words, with a few exceptions such as moons and asteroids that may have formed more slowly, everything in our Solar System is the same age: 4.6 billion years old.
