Our Solar System resides in the _______________ Galaxy
Fill in the blank(s) with correct word
Milky Way
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What could have been habitable if the Sun had been twice as massive?
A: Mercury B: Venus C: Jupiter's moons D: Neptune E: Pluto
The following objects are found in a spiral arm of a galaxy. Which is the exception?
a. population II stars b. OB associations c. emission nebulae d. population I stars e. clouds of gas and dust
How does gravitational lensing tell us about the mass of a galaxy cluster?
A) The lensing broadens spectral lines, and we can use the broadening to "weigh" the cluster. B) Using Einstein's general theory of relativity, we can calculate the cluster's mass from the precise way in which it distorts the light of galaxies behind it. C) The lensing allows us to determine the orbital speeds of galaxies in the cluster, so that we can determine the mass of the cluster from the orbital velocity law. D) Newton's universal law of gravitation predicts how mass can distort light, so we can apply Newton's law to determine the mass of the cluster.
An empty spice bottle has an inner volume of 1.31 × 10^?4 m3 . It has a mass of 112 g when filled with air, and it displaces 1.63 × 10^?4 m3 of water when fully submerged. What fraction of the total volume of the bottle will be beneath the surface when it is placed in a tank of water?
a. 0.69 b. 0.81 c. 0.85 d. 1.00 e. 1.46