The Hubble Space Telescope has been repaired
a. True
b. False
Indicate whether the statement is true or false
True
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One observation that suggests that the Earth has a dense central core is that
A) the Earth has plate tectonics B) surface rocks have the same density as the overall density of the planet C) surface rocks have a lower density than overall density of the planet D) surface rocks have a higher density than the overall density of the planet
Sirius is a binary star, consisting of Sirius A and Sirius B. Sirius B is a
a. red giant. b. white dwarf. c. planetary nebula. d. neutron star.
The expression(s) indicating the mass number of a nucleus is
a. A b. N c. Z d. Z + N e. A – Z
The orbits of many extrasolar planets detected to date are
A) parabolic B) highly elliptical C) perfectly circular D) slightly elliptical