Approximately 4.6 billion years ago, our solar system formed from a cloud of gas and dust called a solar nebula that swirled around, eventually collapsing under its own gravity into a rapidly rotating ...

This video segment adapted from NOVA scienceNOW follows scientists analyzing meteorites—the oldest rocks in the solar system—to determine what triggered the birth of our solar system from a vast cloud ...

Water found deep within the planet's interior contains different ratio of heavy hydrogen isotopes and normal hydrogen, pointing toward separate point of origin Flickr / Creative Commons Scientists ...