The solar system is 4.54 billion years old, based on rock dating. Gas giants (Jupiter and Saturn) likely formed first. Ice giants (Uranus and Neptune) probably formed next. Rocky planets formed last, ...

If you could go back 4.6 billion years, you would see a time before our solar system even existed. But space wouldn’t be empty—you would encounter a cloud of gas and dust in place of our sun and the ...

A series of three powerful flares and associated explosions of solar material out across the Solar System have set Earth ...