__________is the hypothetical source of comets, a swarm of icy bodies understood to lie in a spherical shell extending to 100,000 AU from the Sun
A) A planetesimal
B) The Oort cloud
C) The Orion nebula
D) A carbonaceous chondrite
B
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The term age of mammals is sometimes used to refer to the ______________ era
Fill in the blank(s) with correct word
In the context of the evidence on evolution of stars, you can estimate the _____ of a star cluster by observing the distribution of the points that represent its stars in the Hertzsprung-Russell (H-R) diagram
A) age B) density C) composition D) mass
What mission landed on Titan in early 2005?
A) Galileo's probe B) Huygens C) New Horizons D) Rover Spirit E) Cassini orbiter
The shape of a magnetic field surrounding a current-carrying conductor is
A) consistent with the inverse-square law. B) radial. C) circular. D) all of these E) neither of these