What is the purpose of interferometry?
A) It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
B) It allows two or more small telescopes to achieve a larger light-collecting area than they would have independently.
C) It is designed to prevent light pollution from interfering with astronomical observations.
D) It reduces the twinkling of stars caused by atmospheric turbulence.
A
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Based on the graph, when was the maximum abundance of CO2 over the past 800,000 years?
A) about 300,000 years ago B) about 125,000 years ago C) 1750 D) now
The crucial test of whether a compound is ionic is whether, when melted, it ______________
Fill in the blank(s) with correct word
Two springs, each with spring constant 20 N/m, are connected in parallel, and the combination is hung vertically from one end. A 50-N weight is then suspended from the other end of the combined spring. How far does the combined spring stretch as it comes to equilibrium?
a. 5 m b. 2.5 m c. 10 m d. 0.63 m e. 1.25 m
A planetary nebula is a(n) ____
a. expanding envelope of ionized gas expelled by a dying medium-mass star b. expanding envelope of neutral gas and dust expelled by a dying medium-mass star c. contracting envelope of dusty material from planets destroyed by a dying medium-mass star d. contracting envelope of ionized interstellar medium absorbed by a dying medium-mass star e. expanding atmosphere of a medium-mass star as it becomes a red giant