Halley's comet is named after the English scientist Edmund Halley because he
A) discovered it.
B) was the first to see it in 1682.
C) calculated its orbit and predicted that it would return in 1758.
D) was the most famous astronomer in England during its appearance.
E) was the first to publish pictures of it and report it to the International Astronomical Union (IAU).
C
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Today, astronomers can detect and measure stellar parallax for thousands of the nearest stars, providing us with direct evidence that Earth really does orbit the Sun. Moreover, as the Parallax Angle animation shows (return to the main "Parallax" screen, and select the "Parallax and Distance" button), these measurements allow us to calculate distances to these relatively nearby stars. If we hope to use parallax to measure distances to even more-distant stars, which of the following telescopes would be most useful?
A. A telescope placed on the same orbit of the Sun as Earth, but on the opposite side of the Sun B. A larger version of the Hubble Space Telescope, placed in Earth orbit C. An extremely large telescope built at the best observing site on Earth D. A telescope that orbits the Sun in the outer solar system
The following images show the four terrestrial planets in our solar system. Rank the planets from left to right based on the amount by which the greenhouse effect increases their surface temperatures, compared to what their temperatures would be without the greenhouse effect, from largest to smallest increase.
More than 96% of the mass of living cells are made of
A) carbon and hydrogen B) carbon C) carbon, hydrogen, oxygen, and nitrogen D) hydrogen and oxygen
Determine the energy stored in the 60-?F capacitor.
A. 2.4 mJ B. 3.0 mJ C. 3.6 mJ D. 4.3 mJ E. 6.0 mJ