The recent gradual rise in the Earth's average surface temperature is commonly referred to as
A) global warming
B) the greenhouse effect
C) ozone depletion
D) global heating
A
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Type I supernovae result from ________ stars which have accreted sufficient additional mass via mass transfer from a close binary companion
Fill in the blank(s) with correct word
The Copernican model did not need to make use of epicycles
a. True b. False Indicate whether the statement is true or false
An electron undergoes a collision with a proton. In the center of mass system, the energy of the electron is 4000 MeV. What is the energy of the electron in the lab system, where the proton is at rest before the collision?
A) 34 GeV B) 37 GeV C) 40 GeV D) 43 GeV E) 46 GeV F) 52 GeV
__________is microscopic solid grains in the interstellar medium
A) Main-sequence dust B) Interstellar dust C) Interstellar mud D) Main-sequence mud