Thirty-five years after Moon-walking astronauts placed special reflectors on the lunar surface, scientists have used these devices to test Albert Einstein’s general theory of relativity to ...

Here's what you'll learn when you read this story: In 1687, English physicist Isaac Newton published his famous Law of Universal Gravitation. The idea that all objects attract in proportion to their ...

Gravity is so weird that it essentially forces cosmologists into subscribing to one of two equally radical conclusions: dark matter exists, or fundamental gravity rules need massive revisions. To ...

New cosmic tests confirm Newton and Einstein's gravity laws hold true across vast distances, spanning hundreds of millions of light-years. This research strongly supports the existence of dark matter, ...

A groundbreaking study, based on observations from the European Space Agency’s billion-pixel Gaia space telescope, has revealed a “gravitational anomaly” that challenges our fundamental understanding ...

Gravity, as most people understand it, is the familiar force that pulls a falling apple toward Earth. But for astronomers and theoretical physicists, it is also a vexing invisible architect that ...