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Our solar system consists of one star (the Sun), eight planets and all their moons, three dwarf planets, and several thousand small solar system objects—asteroids, comets, trans-Neptunian objects, and other small bodies. The Sun’s age was calculated in 1989 to be 4.5 billion years old, less than the 4.7 billion years previously believed. It was formed from a cloud of hydrogen mixed with small amounts of other substances that had been produced in the bodies of other stars before the Sun was born. This was the parent cloud of the solar system. The dense, hot gas at the center of the cloud gave rise to the Sun; the outer regions of the cloud—cooler and less dense—gave birth to the planets.
This video shows how a solar system forms. Video courtesy of NASA
.com/ipa/0/0/0/4/4/3/A0004431.html
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This video shows how a solar system forms. Video courtesy of NASA
.com/ipa/0/0/0/4/4/3/A0004431.html
Sources +
Our Common Sources
Our Common Sources
Astronomical Terms
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TrendingHere are the facts and trivia that people are buzzing about.
Did Birds Evolve from Dinosaurs?
The Twelve Dancing Princesses
Current Events This Week: January 2023
African Americans by the Numbers
Andersen’s Fairy Tales: Contents
The Celtic Twilight: A Teller of Tales
TrendingHere are the facts and trivia that people are buzzing about.
Did Birds Evolve from Dinosaurs?
The Twelve Dancing Princesses
Current Events This Week: January 2023
African Americans by the Numbers
Andersen’s Fairy Tales: Contents
The Celtic Twilight: A Teller of Tales
- Did Birds Evolve from Dinosaurs?
- The Twelve Dancing Princesses
- Current Events This Week: January 2023
- African Americans by the Numbers
- Andersen’s Fairy Tales: Contents
- The Celtic Twilight: A Teller of Tales
