If we compress the entire history of the into one year, each month represents
A) about a billion years
B) a few tens of millions of years
C) a few hundred years
D) a few million years
A
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Radio telescopes image a universe much ________ in temperature than with visible light
Fill in the blank(s) with correct word
The huge, dark, almost spherical regions between the superclusters of galaxies are called ________
Fill in the blank(s) with correct word
Circular Motion of Charges: A proton, starting from rest, accelerates through a potential difference of 1.0 kV and then moves into a magnetic field of 0.040 T at a right angle to the field. What is the radius of the proton's resulting orbit? (e = 1.60 × 10-19 C, mproton = 1.67 × 10-27 kg)
A. 0.080 m B. 0.11 m C. 0.14 m D. 0.17 m
The "Local Bubble" is:
A) created by our Sun's solar wind, and extends well past Pluto's orbit. B) created by the bipolar jets of the young Sun, perpendicular to the ecliptic. C) about 100 pcs. across and transparent to extreme ultraviolet radiation. D) the region around the Milky Way where we can trace out its magnetic field. E) the cluster of galaxies our Milky Way and M-31 in Andromeda belong to.