A. planet B. galaxy C. universe D. constellation 相关知识点: 试题来源: 解析 B。本题考查银河系相关的概念。选项A“planet”(行星)与银河系概念完全不同;选项B“galaxy”(银河系),我们的太阳系位于银河系中,符合题意;选项C“universe”(宇宙)范围太大,不准确;选项D“constellation”(星座)与银河系不...
They have had to be changed. 75.From sitting at the center of the universe, we now find the earth orbiting(绕轨道运行) the sun, which is just one of millions of stars in our own Milky Way Galaxy(银河系).76.But this is not the end of a long history of research. Huge questions r...
Galaxy: haloStars: population IIIn the usual and most widespread textbook picture of the Milky Way Galaxy, disk stars like the Sun are referred to as Population I, the spheroidal or halo component in turn as Population II. The latter is thought of as the pressure-supported, metal-poor ...
The “River of Heaven”, the “Ganges of the Sky”, the “Vía Láctea.” All are names for what we call our home galaxy, the Milky Way. In summer, it’s some sight under dark skies, and now is the very best time of the year to see it arch across the night sky. Why Is ...
3.___ From sitting at the center of the universe, we now find the earth orbiting(绕轨道运行)the sun, which is just one of millions of stars in our own Milky Way Galaxy(银河系). 4. E But this is not the end of a long history of research. Huge questions remain to be answered ...
Earth’s galaxy is called the Milky Way.The largest black holes are called “supermassive”(超大质量黑洞). These black holes have masses that are more than one million suns together. Scientists have found proof that every large galaxy contains a supermassive black hole at its center. The ...
Aldebaran is the 14th brightest star in our night sky. It is a red giant that appears reddish-orange. Stars become red giants once all their hydrogen is fused into helium.Answer and Explanation: Aldebaran is a star located in the Milky Way galaxy, our galaxy, and is approximately 65 ...
If the Earth is typical, intelligent life could develop on other such planets and potentially develop interstellar travel. Even at a slow pace of colonization (a small fraction of the speed of light), the Milky Way galaxy could be completely traversed in a few million years, a tiny fraction...
The equation aimed to find the number (N) of intelligent civilizations within the boundaries held by the subsequent factors—in our case, the Milky Way Galaxy. R* is the rate of formation of stars that could potentially allow for the development of intelligent life on planets nearby; fp is ...
While some intelligent extraterrestrial civilizations might choose to remain hidden, as suggested by the dark forest theory, it’s unlikely that every single one would adopt the same fear-driven strategy. The scale of the paradox Our home galaxy, the Milky Way, contains an estimated 100 to 400...