What discovery in 1998 changed our understanding of the overall history of the universe?
A) The universe is permeated with radiation at microwave frequencies.
B) The universe is expanding, and has been since the Big Bang.
C) The expansion of the universe is slowing, and will eventually reverse, ending in a Big Crunch.
D) The expansion of the universe is accelerating, due to an unknown cause known as dark energy.
E) Rotational measurements of our galaxy and others demonstrated the existence of dark matter.
Correct Answer:
Verified
Q40: The color theory explains why quarks:
A)form particles
Q41: A galaxy 200 Mpc from us has
Q42: Dark matter is suspected to exist in
Q43: Messenger particles of the strong interaction are
Q44: Baryonic matter (protons and neutrons)comprises what fraction
Q46: The quark content of a proton is:
A)uuu
B)uud
C)udd
D)ddd
E)uds
Q47: The up quark u has charge +2e/3
Q48: The quark content of a
Q49: The up quark u has charge +2/3
Q50: The intensity of the microwave background radiation,
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