Every year in early January, Earth reaches the closest point in its orbit to the Sun, a moment astronomers call perihelion.

The cycles found throughout nature are full of endings, fresh starts, and plenty of resets, whether we are talking about ...

Climate can change fast, even when the planet looks stable. Earth has flipped into new patterns within decades in the past.

Discover how the Earth started spinning, the impact of the Theia collision, and how the Moon's gravity is gradually slowing ...

Researchers find that shifts in Earth’s orbit can trigger abrupt climate changes, even in warm periods without ice sheets.

Study finds Mars helps pace Earth's ice ages through gravity. Remove Mars, and a major 2.4-million-year climate rhythm ...

Which way is ‘down’ has a different answer depending on where you are on Earth, in the solar system, in our galaxy and beyond ...