What can be said with certainty about a red star and a blue star?
A) The red star is closer to Earth than the blue star.
B) The red star is more massive than the blue star.
C) The blue star has a greater proper motion than the red star.
D) The blue star is hotter than the red star.
E) The red star has a greater radial velocity than the blue star.
D
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The nucleus of a comet is typically
A) a few hundred kilometers across, and bright, shiny white from its ices. B) a few meters in diameter. C) located between the orbits of Mars and Jupiter. D) a few kilometers in size, and very low in density. E) very durable, made of iron.
Who discovered the first four pulsars?
A) Anthony Hewish B) Martin Schwartzschild C) Jocelyn Bell D) Carl Sagan E) Stephen Hawking
In addition to the proper chemistry, it is ________ that determines the feasibility of life on a given planet
Fill in the blank(s) with correct word
A flask brim filled with water is on a weighing scale. If you float a piece of wood in it, after spillage away from the scale, the scale reading will be
A) less. B) the same. C) greater.