声音简介Stars aren't solid like the ground beneath your feet. Instead, they are made of gases like the air around you. The two main gases in stars are called hydrogen and helium. They are the stars' fuel. Stars make heat and light from them. ...
Answer and Explanation:1 Stars, like the Sun in our solar system, are simply balls of blazing hot gases. They are mostly made up of helium and hydrogen. The largest stars in... Learn more about this topic: Types of Stars | Classification, Size & Life Cycle ...
Stars generate energy through nuclear fusion processes in their cores by which they turn hydrogen into helium. When stars with at least eight times the mass of our sun run out of that hydrogen supply, they start fusion reactions involving other elements instead — helium, carbon, oxygen, and ...
Stars are like nuclear reactors. They take a fuel and convert it to something else. Hydrogen is formed into helium, and helium is built into carbon, nitrogen and oxygen, iron and sulfur—everything we’re made of. … So most of the material that we’re made of comes out of dying sta...
When we look up at the night sky, we see a glittering carpet of stars. These twinkling pinpricks of light are actually massive balls of plasma—super-heated helium and hydrogen gas. They are powered by nuclear fusion, come in many different forms, and have a fascinating evolutionary trajec...
24 Why are weather balloons sometimes filled with helium rather than hydrogen?D A Helium is found in air. B Helium is less dense than hydrogen. C Helium is more dense than hydrogen. D Helium is unreactive. 相关知识点: 试题来源: 解析 D ...
Although all of these heavy elements are quite rare compared to hydrogen and helium, they are found just about everywhere. Heavy elements are continually being manufactured by stars and released into space by stellar deaths, so their amount compared to hydrogen and helium gradually rises with ...
Two containers are respectively filled with hydrogen and helium. If their temperature and mass are equal, then:A.The average translational kinetic energy of the two gas molecules is equal.B.The average kinetic energy of the two gas molecules is equal.C
F.Basically,they are big exploding (爆炸的) balls of gas,mostly hydrogen and helium (氦).The nearest one to us,the sun,is so hot that the huge amount of hydrogen is undergoing a constant star?wide unclear reaction,like in a hydrogen bomb. G.It depends upon the kind.Most of them are...
" many of the elements in our bodies - "the nitrogen in our DNA, the calcium in our teeth, the iron in our blood" - were forged in the interiors of stars, in a process called stellar nucleosynthesis (element formation). Lighter elements, such as hydrogen and helium, were created in ...