题目What is true about supermassive black holes? A. They are only a few times more massive than the sun. B. They are formed from small stars. C. They can be billions of times more massive than the sun. D. They do not have a strong gravitational pull. ...
Even if the sun becomes a black hole,Earth would still be safe. ( )1. Which of the following is NOT true about black holes? A. They look like dark circles with a bright ring around the outside. B. They are about 55 million light years away from Earth. C. Black holes look "...
Which of the following is NOT true aboutblack holes?A. They look like dark circles with abright ring around the outside.B. The black hole in the picture is about 55million light years away from the earth.C. They look black because they pulllight to them and “eat"it.D. Scientists ...
Even if the sun becomes a black hole, Earth would still be safe. 1. Which of the following is NOT true about black holes? A. They are about 55 million light years away from Earth. B. Black holes look “black” because they pull light and “eat” it. C. There is more than one ...
That "stuff" forms an accretion disk around the black hole. (Image credit: NASA/CXC) How big are black holes? The black hole in Cygnus X-1 has a mass about 20 times that of the sun, which is pretty typical for black holes throughout the universe. In our own galaxy, scientists have...
What We Know About Black HolesMatthew Francis
(1)Which of the following is NOT true about black holes? ___A.They look like dark circles with a bright ring around the outside.B.They are about 55 million light years away from the Earth.C.Black holes look "black" because they pull light and "eat" it.D.Scientists say that there...
and adults happen to find water-filled tree holes that are a potential development site for their offspring, thus, they could develop in Dendrotelmata and survive, but their long-term usage of this site is not well documented. Further studies in different habitat could provide key information ...
What is a black hole event horizon? It marks the boundary between the black hole and the rest of the universe. What is special about this boundary? Nothing inside the horizon can ever escape or come back across this boundary, not even light. This implies that nothing that enters the blac...
30.21 海南中考)—S Sandy, do you know?Yes. Some news about black holes. A. what Tom is searching for B. what is Tom searching for C. who Tom is searching for 相关知识点: 试题来源: 解析 30.A [提示:本题考查宾语从句的用法。 宾语从句要用陈述语 序,先排除B;根据答语“是的。 一些...