Harsh flares, bright beginnings and a tight
gravitational grip on the innermost planets could be disastrous for any liquid water that's available.
As the cosmos expanded, matter gradually spread out, and
its gravitational grip weakened, hitting a balance with dark energy about 5 billion years ago, causing the expansion to coast at a steady rate for a while, neither accelerating nor slowing down.
Water mining on comets and asteroids should be far more cost - effective than heaving tons of H2O out of Earth's
gravitational grip.
Before LIGO, astronomers could only infer a black hole's existence by watching the behavior of objects caught in
its gravitational grip.
One idea is that the Sun is losing enough mass, via fusion and the solar wind, to gradually be losing
its gravitational grip (see Astronomical unit may need to be redefined).
Because
their gravitational grip is weak, the gas could have been pushed out before many stars could form; a few giant stars may have blasted it out with their fierce heat and explosive deaths, for example.
How much material do high - energy objects, like exploding stars or ravenous black holes, toss out of their galaxy's
gravitational grip?
As the star sheds its outer layers, it becomes less massive, loosening
its gravitational grip.
Over time, clusters without dark matter slowly lose
their gravitational grip on the stars at their edges, the team found, whereas those with halos hold onto these stars.
This problem would not arise if the individual particles of dark matter had more mass, because then they would find it harder to escape from
the gravitational grip of the galaxy.
The huge galaxy in this image, NGC 4490, has a smaller galaxy in
its gravitational grip and is feeling the strain.
According to the accepted view, the stars are held in
the gravitational grip of a lot more matter than is visible as stars, nebulae and so on.
Astronomers are trying to understand how apparently young stars were formed so deep inside the black hole's
gravitational grip and how they survive in an extreme environment.
A faint chance existed that the sun would lose too much mass before getting too big, and would allow the Earth to escape into a wider orbit as the sun loses
its gravitational grip.
Stars would orbit more quickly in
the gravitational grip of a black hole, which would be several thousand times more massive than our sun.
SDSS studies have probed the dark matter environments of quasars through clustering measurements, revealed populations of quasars whose central engines are hidden by obscuring dust, captured changes in quasar spectra that show clouds moving in
the gravitational grip of the central black hole, and allowed a comprehensive census of the much fainter accreting black holes (active galactic nuclei, or AGN) in present - day galaxies.