Which of the following has not been detected around other stars in the Galaxy?

A) a collapsing nebula of gas
B) flattened, spinning disks
C) jovian planets
D) asteroids
E) strong stellar winds


D

Physics & Space Science

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A projectile is launched from the surface of a planet (mass = m, radius = r). What minimum launch speed is required if the projectile is to rise to a height of 2r above the surface of the planet? Disregard any dissipative effects of the atmosphere.

A.


B.

C.

D.

E.

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