Why do spirals seem to be more abundant on the HST deep surveys than they are in the present universe?
What will be an ideal response?
In mergers between nearly equal galaxies over time, the spiral arms were lost, as was much gas and dust into the intergalactic medium, leaving behind the slowly spinning ellipticals.
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A 2.5-mC charge is on the y-axis at y = 3.0 m and a 6.3-mC charge is on the x-axis at x = 3.0 m. What is the direction of the potential at the origin?
A. 22.0
B. 168
C. 292
D. 332
E. potential has no direction
Significant Figures: Express the sum of 420.77, 13.821, and 2317.8 to the correct number of significant figures.
Fill in the blank(s) with the appropriate word(s).
What is our best hypothesis for why all the planets in our solar system orbit in the same direction as the Sun rotates?
A) The planets and Sun formed from the same, single, rotating gas cloud. B) It's a complete coincidence. C) The planets were pulled out of the Sun by a major interaction with another star. D) Almost everything in our Galaxy rotates in the same direction. E) The Sun did not initially rotate, but the planets gravity caused it to start rotating in the direction in which the planets orbit.
How do Tadpole galaxies get their shapes?
A: They form in a region of chaotic spacetime expansion. B: They're spreading out on their own due to internal pressures. C: They are the results of ellipticals with powerful x-ray jets coming from their cores. D: They were fully-formed spiral galaxies before, and lost some arms to black holes. E: They respresent merging galaxies.