Why was it difficult for astronomers to develop a clear understanding of the Milky Way until the last few decades?
What will be an ideal response?
Interstellar dust obscures most of the light from the galactic center and blocks light from many parts of the disk. Until modern telescopes were able to look at other parts of the electromagnetic spectrum, the galaxy could not be studied and understood in detail.
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Oxygen in Earth's atmosphere is outgassed in volcanic eruptions
Indicate whether the statement is true or false
Capacitors in Combination: When two or more different capacitors are connected in series across a potential source, which of the following statements must be true? (There could be more than one correct choice.)
A. The total voltage across the combination is the algebraic sum of the voltages across the individual capacitors. B. Each capacitor carries the same amount of charge. C. The equivalent capacitance of the combination is less than the capacitance of any of the capacitors. D. The potential difference across each capacitor is the same. E. The capacitor with the largest capacitance has the most charge.
What causes the outward gas pressure that balances the inward pull of gravity in a main sequence star?
a. The rapid outward flow of gas. b. The rapid inward flow of the gas. c. The high temperature of the gas. d. The high density of the gas. e. c and d
On a Hertzsprung-Russell diagram, where on the main sequence would we find stars that have the greatest mass?
A) upper right B) lower right C) upper left D) lower left