If two gases made of many particles were to collide, the probability of collisions between the particles would be high. In their research, astronomers at the European Southern Observatory pointed the SEST telescope in Chile at the Centaurus A galaxy. They found evidence of molecular hydrogen on its outskirts. Another research team detected the gas clouds in 1994, but could not explain how it was possible that the gas had not been pulled into Centaurus A's core. Probably, Charmandaris said, though not for a very long time.
Voyager helps prove shock wave at edge of solar system.
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