Our solar system's journey around the center of the Milky Way takes it through varying galactic environments, and one may ...
The stars as seen from Earth would have looked dimmer 14 million years ago, as the solar system was in the middle of passing ...
Earth formed over 4.5 billion years ago from a swirling cloud of gas ... from molten nickel and iron that can reach temperatures of 9,000 degrees Fahrenheit (5,000 degrees Celsius).