The observational evidence in favor of the existence of dark energy involves using ________ to calculate ________.
A. the method of standard candles; the distance to distant galaxies
B. the method of inflation; the distance to distant galaxies
C. Hubble's law; the distance to distant galaxies
D. Hubble's law; the age of the Universe
Answer: A
You might also like to view...
Why couldn't life have originated on any of the Jovian planets?
What will be an ideal response?
Alcohols are distinguished by the fact that at least one hydrogen atom in a hydrocarbon has been replaced by a(n)
a. carboxyl group. b. alkyl group. c. hydroxyl group. d. oxygen atom.
A proton and an alpha particle are moving perpendicular to a uniform magnetic field with the same speeds. If the velocity of the proton is at an angle of 20° with respect to the magnetic field direction, at what angle to the magnetic field direction would the alpha particle be moving if it experiences the same magnitude magnetic force as the proton? The alpha particle has 4 times the mass of the
proton and twice its charge. a. 10° c. 43° b. 62° d. 9.8°
Communications and weather satellites always appear at the same place in the sky because these satellites are
A) beyond the pull of Earth's gravitational field. B) moving at a speed just short of escape velocity. C) orbiting Earth with a 24-hour period. D) stationary in space. E) none of the above