Earth is our home planet, and it's the only place in the universe where we know for certain that life exists. Earth formed over 4.5 billion years ago from a swirling cloud of gas and dust squished ...

Figuring out how helium-3 got incorporated into the core during Earth's formation is very important for understanding when the planet formed, Olson said. Light gases like helium hung around in the ...

Alan Dyer/Getty Images The solar system has eight planets overall – Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Mercury is the closest planet to the sun and Earth is the ...

What water, chemistry and temperature cycles fostered the chemical reactions that allowed life to emerge on our planet? Because life arose in the largely unknown surface conditions of Earth’s early ...

Prepare for an unforgettable “planet parade” as seven planets will ... appear to line up in the sky from our perspective on Earth, per NASA. February’s planetary alignment will bring seven ...

The alignment is known as a planet parade — a planetary lineup in space from Earth’s perspective. The alignment takes place over time as each planet in the solar system orbits the sun at its ...