Among the following planets, which one has a very thick atmosphere mainly composed of carbon dioxide? A. Earth B. Mars C. Venus D. Neptune 相关知识点: 试题来源: 解析 C。解析:金星有非常厚的大气层,主要由二氧化碳组成。地球的大气成分较为复杂但不是以二氧化碳为主,A错误;火星大气层很稀薄,B...
Uranus and Neptune are about ten times as dense as hydrogen planets of the same mass, and their mean atomic weights are about four; these planets are presumably composed mainly of water, methane and ammonia. The cosmogonical significance of these results is briefly discussed....
The inner planets are: Mercury, Venus, Earth, and Mars. They are relatively small, composed mostly of rock, and have few or no moons. The outer planets include: Jupiter, Saturn, Uranus, Neptune, and Pluto (a dwarf planet). They are mostly huge, mostly gaseous, ringed, and have many ...
particles in this disk began sticking together, forming planetesimals — the building blocks of planets. Over millions of years, these objects grew larger, sweeping up material in their orbits and becoming the planets we know today.
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The atmosphere on Venus is dense and toxic. It is composed mostly of carbon dioxide with clouds of sulfuric acid. On Venus, the Sun rises in the west and sets in the east. Unlike most other planets in the solar system, Venus rotates on its axis in the opposite direction. ...
All this time, the Sun also grew bigger and brighter because it was collecting more and more matter. It became the dominant force in the solar system, accounting for the vast majority of the solar system's mass — more than all the planets, asteroids and comets put together. ...
Terrains of the Planets Although man has only been able to set foot on the moon so far, modern innovations such as high-powered telescopes, satellites and space probes have enabled scientists to map out the surfaces of most of the other planets in the solar system. While some have no ...
Terrestrial and sub-Neptune planets are expected to form in the inner (less than 10 au) regions of protoplanetary disks1. Water plays a key role in their formation2,3,4, although it is yet unclear whether water molecules are formed in situ or transported from the outer disk5,6. So fa...
The sand that makes up these dunes is likely composed of materials such as basaltic sand, which is common on Mars. Basaltic sand contains minerals that can give it a distinct color under different lighting conditions. The blue hue is not an inherent color of the sand but rather an optical ...