Briefly explain why starburst galaxies appear fairly ordinary when they are observed in visible light but extraordinary when they are observed in infrared light
What will be an ideal response?
Starburst galaxies are filled with star-forming molecular clouds, which contain dust grains that absorb most of the visible light produced by the young stars. This radiation heats the dust grains to very high temperatures, and they re-emit all the absorbed energy as infrared light.
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Instructions: On occasion, the notation 
will be a shorthand notation for 
.
A vector,
, when added to the vector 
yields a resultant vector which is in the positive y direction and has a magnitude equal to that of 
. What is the magnitude of ?
A. 3.2
B. 6.3
C. 9.5
D. 18
E. 5
The International Date Line in theory is ___________, with variations to accommodate the needs of various countries
a. a longitude b. a meridian c. a latitude d. a parallel e. none of these
The Mohorovicic discontinuity occurs because of a
A) change in temperature with depth. B) shift in the density of minerals with the same composition. C) change in the composition of rocks on both sides of the boundary. D) density change in rocks of the same composition on both sides of the boundary.
Significant Figures: What is the quotient of 2.43 ÷ 4.561 expressed to the correct number of significant figures?
A. 5.3278 × 10-1 B. 5.328 × 10-1 C. 5.33 × 10-1 D. 5.3 × 10-1