You don't get to meet your double every day, but Jupiter and the sun share the same galaxy as their very own doppelgangers.
Powerful jets of material spewing from the edge of monster black holes may be more likely to arise where two galaxies have merged together.
Astronomers have discovered 11 entire galaxies that have undergone some unpleasant gravitational turbulence and flung from their home clusters, marooned in intercluster space.
If our planet had no gravity, what would happen? Would we all just float away like so many spacesuited George Clooneys? Join us in a little thought experiment, as we ponder a world that doesn't pull us down.
It's not a spare moon of ours, exactly, but Earth does have a sort of gravitational buddy out there, in the mellifluously named 3753 Cruithne. It orbits the sun, just like us, and is locked with Earth in what scientists call orbital resonance.
The BICEP2 gravitational wave announcement may have been premature, but the search has only just begun -- an interview with cosmologist Kendrick Smith.
For the first time, the mass of a binary pulsar pair has been precisely measured, but it was a race against time before the extreme gravitational warping of spacetime caused one of the dense objects to blip out of view.
How does time stop everything from happening at once? What mechanism drives time forward, but not backward? Continue reading →
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