The natural background radiation we personally encounter is
A) a trace amount.
B) about a quarter.
C) about half.
D) more than half.
Answer: D
Physics & Space Science
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Clusters of galaxies are distributed in space ____
a. homogenously b. isotropically c. in long, narrow filaments surrounding empty voids d. statically e. in bubbles surrounded by empty walls
Physics & Space Science
One light-year (ly) is about _____
A) 23,000 AU B) 34,000 AU C) 56,000 AU D) 63,000 AU
Physics & Space Science
The _______________ is a high temperature, low density region in the interstellar medium around the Sun
Fill in the blank(s) with correct word
Physics & Space Science
A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate heat into empty space? (? = 5.67 × 10-8 W/m2 ? K4)
A) 7.1 W B) 0.71 mW C) 1.4 kW D) 9.9 mW E) 3.7 W
Physics & Space Science