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Mercury is a difficult planet to observe from the Earth because...

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What evidence do asteroids provide about the nature of the first planetesimals?a. The largest asteroids may be examples of the original planetesimals; they had differentiated, developed molten metal cores, and sometimes lava flows on their surfaces.b. The largest asteroids may be examples of the original planetesimals; they had radioactive decay in their cores and evidence of volcanism in the past.c. The smallest asteroids may be examples of the original planetesimals; they had radioactive decay in their cores and evidence of volcanism in the past.d. The smallest asteroids may be examples of the original planetesimals; they had differentiated, developed molten metal cores, and sometimes lava flows on their surfaces.

What evidence suggests that meteorites were once part of larger bodies broken up by impacts?a. All meteorites have irregular shapes and came from the asteroid belt where all objects are spherical; this means that asteroids split before their fragments fall on the Earth's surface.b. Crystals in iron meteorites show that they cooled very slowly; this low cooling rate is consistent with existence in bodies much larger than the meteorites' size. Stony and iron meteorites resulted when these bodies melted and differentiated into metal cores at their centers with stone on top, and then were later fragmented.c. The mass and size of typical meteorite falls are much smaller than for average objects in the asteroid belt, therefore asteroids must fragment.d. Many collisions in the asteroid belt are observed each year through Earth-based and orbital telescopes, therefore asteroids are constantly splitting to pieces and may be fragments of a Terrestrial-type planet formed and destroyed at early stages of the Solar System.

The ring systems around Jupiter and Saturn lie outside those planet's respective Roche limits. True or false? How do you know?a. False. No object can lie outside a planet's Roche limit because such an object would quickly escape the planet's gravity and orbit around the Sun.b. True. Jupiter and Saturn are very large and the radius of their Roche limits is smaller than the radius of the planet.c. True. No object can orbit inside a planet's Roche limit because such an object would be quickly dragged into the planet's atmosphere.d. False. If they were located outside the Roche limit, they could hold themselves together as larger objects rather than small dust particles.

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