A quiet but measurable shift in Earth’s gravity field between 2006 and 2008 has baffled scientists for years. Now, nearly two decades on, new research suggests the anomaly may have been triggered by a ...

The total mass loss rate and outflow speed from its 3I/Atlas surface was used to infer its mass. The mass of 3I/ATLAS must be ...

Astronomers uncover a cosmic mystery: an extra image in an Einstein Cross points to a massive dark matter halo.

Although we take a lot of scientific knowledge for granted today, each of the basics – whether it be about light, gravity, mass or the shape of the Earth – had to be theorized and experimentally ...

Despite keeping us grounded and warping light that travels through space, gravity is actually quite a weak force. The smaller the mass, the less gravity appears to have any pull, until at quantum ...

Energy-momentum distribution remains a fundamental yet challenging aspect of theoretical physics. In general relativity, the localisation of gravitational energy is obscured by the equivalence ...

Something seems to be missing from the universe, and the favored model of physics calls it “dark matter” – but despite a century of searching, it remains a no-show. A new paper proposes an alternative ...

Mass is mass is mass. Physicists have three different definitions of mass, all thought to be equivalent. Measurements of the distance between Earth and the moon confirm that two of those masses are ...

Mike Moss's weather blog post on the "plethora of optical phenomena" recently seen over Huntsville, Ala., reminded me a bit of a similar but space-based optical phenomenon. It's not crystals, which ...