According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
A) because the Sun's gravity was stronger in the outer solar system, allowing more solid material to collect
B) because only metal and rock could condense in the inner solar system, while ice also condensed in the outer solar system
C) because gas in the outer solar system contained a larger proportion of rock, metal, and hydrogen compounds than the gas in the inner solar system
D) because only the outer planets captured hydrogen and helium gas from the solar nebula
B
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What is the celestial sphere?
A) The celestial sphere is a representation of how the entire sky looks as seen from Earth. B) The celestial sphere is a model that shows the true locations in space of the Sun and a few thousand of the nearest stars. C) The celestial sphere is a model of how the stars are arranged in the sky relative to our Sun, which is in the middle of the sphere. D) It represents a belief in an Earth-centered universe, and hence is no longer considered to have any use.
A standard candle is
A) a 7-cm-long wax candle. B) another name for a main-sequence star. C) another name for a barred-spiral galaxy. D) a light source of known luminosity.
In the UNS designation system, high-strength low-alloy steels start with the letter _________.
Fill in the blank(s) with the appropriate word(s).
Describe the impact the discovery of extrasolar planets h as had for understanding the origin of our own Solar System
What will be an ideal response?