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There’s a third way to measure the Hubble constant that uses collisions of extremely massive objects in space—such as black holes and/or neutron stars—as “standard sirens.” These collisions can ...

Artist's impression of neutron stars merging, producing gravitational waves and resulting in a kilonova. Credit: Mark Garlick, University of Warwick, from Wikipedia licensed under CC BY 4.0.

From apples to planets, the force of gravity can be described using this equation where G is something called the gravitational constant (6.67 × 10^-11 newton-metre^2-kilogram^−2, or big G ...

The strength of this force depends on the gravitational constant. Denoted by a ‘G’, it is a fundamental physical constant. It was first accurately determined by Henry Cavendish in 1797.

Gravitational waves are going to change the way we look at the universe. These waves, put out by literally everything that has mass or energy, permeate our entire universe and form a background ...

In June, researchers from the North American Nanohertz Observatory for Gravitational Waves, or NANOGrav, published the results of 15 years of observations, finding evidence for a constant, ...

Big G, known formally as Newton’s gravitational constant, describes the strength of gravity. But its precise value remains a mystery. Neil Webb By James R. Riordon July 20, 2023 at 8:00 am ...

Scientists on Wednesday unveiled evidence that gravitational waves, the ripples in the fabric of space-time predicted by Albert Einstein more than a century ago, are permeating the universe at low ...

In 2015, scientists at the Laser Interferometer Gravitational-Wave Observatory detected these waves for the first time, in a massive breakthrough that rocked the world of astrophysics.

NANOGrav’s 12.5-year dataset, released in 2021, was a compelling hint that the gravitational wave background was out there, but the new data—their 15-year dataset—includes evidence of ...