A. Asteroids are composed of rock and metal. B. Asteroids orbit the sun between Mars and Jupiter. C. Large near-Earth asteroids are sure to strike Earth. D. A large asteroid colliding with E. arth would cause a disaster. 相关知识点: 试题...
Lucy's powerful cameras, including a spectrometer that can see what the asteroids are composed of, will observe the rocks' composition, mass, and geologic history. They'll see how icy the Trojans are, and how different they are from each other. Planetary scientists already know some are dark...
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Unlike planets, asteroids are not circular. Their shapes are erratic and jagged. Many asteroids are smaller than pebbles, yet some have diameters of hundreds of kilometres. The majority of asteroids are composed of various types of rocks, although some also contain clays or metals like nickel ...
The first questions that all potential investors ask, of course, are what is the nature of these abundant resources contained in asteroids and comets, and what are they worth? Scientists answer first that the asteroids are composed of iron, nickel, platinum, and other metals, as well as sul...
The podia found in the Order Clypeasteroida are composed of three basic systems: (1) a specialized external epithelium, (2) a connective tissue sheath enclosing a hydrostatic skeleton, (3) an intrinsic smooth muscle system. The components of each system are described using histology and ...
Asteroids：小行星.Asteroids,also known as “minor planets”,are numerous in the outer space.any of numerous small celestial bodies composed of rock and metal that move around the sun (mainly between the orbits of Mars and Jupiter)comets:彗星 (astronomy) a relatively small ...
11.Other asteroids combined together to form are now planets and satellites. 其他小行星结合在一起形成了现在的行星或者是它们的卫星. 12.These asteroids are like the terrestrial planets, in that they're composed mostly of rocky material and metals. ...
B、They have undergone approximately the same number of collisions. C、They are monoliths. D、They are composed of fragments that have escaped the gravity of larger asteroids. E、They were detected only recently. 答案: C 经典答疑 发起提问 ...
Asteroids of a third class, much less numerous than those of the first two, are composed primarily of metal and are calledM-type asteroids(“M” for metallic). Spectroscopically, the identification of metal is difficult, but for at least the largest M-type asteroid, Psyche, this identificatio...