Câu hỏi
A. It will be enveloped in the expanding surface of the sun. B. It will become too hot for life to exist C. It will be almost destroyed by nova explosions. D. It will freeze and become solid. Question 4: When the Sun has used up its energy as a red giant, it will __ A. get frozen B. cease to exist C. stop to expand D. become smaller Question 5: Large amounts of gases may be released from the Sun at the end of its life as a __ A. black dwarf B white dwarf C. red giant D. yellow dwarf Question 6: As a white dwarf, the Sun will be __ A. the same size as the planet Mercury B. around 35 million miles in diameter C. a cool and habitable planet D. thousands of times smaller than it is today Question 7: The Sun will become a black dwarf when __ A. the Sun moves nearer to the Earth B. it has used up all its fuel as a white dwarf C. the core of the Sun becomes hotter D. the outer regions of the Sun expand
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Trả lời
Question 4: When the Sun has used up its energy as a red giant, it will**B. cease to exist**Explanation: The Sun will eventually exhaust its nuclear fuel and go through a series of transformations, including becoming a red giant. After this phase, it will shed its outer layers, leaving behind a hot core that will cool and shrink into a white dwarf. The Sun will not "cease to exist" in the sense of disappearing entirely; rather, it will transition into different states.Question 5: Large amounts of gases may be released from the Sun at the end of its life as a**C. red giant**Explanation: At the end of its life, the Sun will expand into a red giant and shed its outer layers, releasing large amounts of gas into space. This process is known as a planetary nebula.Question 6: As a white dwarf, the Sun will be**D. thousands of times smaller than it is today**Explanation: When the Sun has exhausted its fuel, it will collapse into a white dwarf, which is a dense, slowly cooling remnant. This state is much smaller than the Sun's current size, as a white dwarf is typically the size of Earth but with much higher density.Question 7: The Sun will become a black dwarf when**B. it has used up all its fuel as a white dwarf**Explanation: A black dwarf is the final evolutionary stage of a white dwarf. When the Sun has used up all its fuel as a white dwarf, it will no longer emit significant amounts of heat or light, becoming a black dwarf. This process occurs over an extremely long timescale, far beyond human comprehension.