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• r  with respect to gravitation
  gravitationally strong forces

• Whenever the sun passes through the Milky Way plane, they suggested, the swirls of dust it encounters would gravitationally disrupt the Oort cloud, a vast bubble of comets that .
• A pair of gravitationally linked stars could wander too close to the black hole that lurks in the galactic core, causing one to be sucked in and the other to be violently flung off .
• Human scientists have better nuclear fuel than the stars have, but they cannot hold their gases together gravitationally.

News & Articles

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• Inseparable galactic twins
  Looking towards the constellation of Triangulum (The Triangle), in the northern sky, lies the galaxy pair MRK 1034. The two very similar galaxies, named PGC 9074 and PGC 9071, are close enough to one another to be bound together by gravity, although no gravitational disturbance can yet be seen in the image. These objects are probably only just beginning to interact gravitationally.
  July 2, 2013 - Science Daily

Quotes

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• Max Planck in Deutsche Welle
  Dark matter is hypothesized to be a strange kind of substance, it interacts gravitationally with matter and therefore we know it's there, but we don't know exactly what it is,Jan Tauber, project scientist for Planck told Deutsche Welle....