Helium:Helium is a chemical element that has the atomic number 2. Its symbol is 'He.' Helium was first discovered in 1868 by Jules Cesar Janssen during a solar eclipse.Answer and Explanation: Helium is a major component of stars, such as our Sun. In fact, helium is the second most ...
According to NASA, Neptune's atmosphere is primarily composed of helium and hydrogen. It also has a small amount of methane. Scientists believe there...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough...
3.Walkingisagoodform(形式)ofexercisefortheyoungandtheold. 4.【学科融合】Whenaballoon(气球)isfilledwithhelium(氦气),itisabletoflyveryhighinthesky.;5.Thesungivesoutlightandheat(热).Withoutthesun,therewillbenolifeontheearth.;二、在各题空白处填入1个适当的单词或括号内单词的正确形式。 1.【地方特色...
Thinking of what the moon is made of might trigger the question 'What is the moon's atmosphere made of?' The moon's atmosphere is made of gasses like neon, helium, and hydrogen, but it is very thin. It is actually so thin that many scientists refer to it as an exosphere instead of...
UCLA: Mercury's Magnetic Field Tells Scientists How Its Interior Is Different From Earth's NASA: Mercury NASA: MESSENGER: The Extreme Machine NASA Science: BepiColombo Cite This Article MLA Markgraf, Bert. "What Is Mercury Made Of?"sciencing.com, https://www.sciencing.com/what-mercury-made-...
helium(92.1percenthydrogen,7.8percenthelium);Thetotal numberofothersubstances("metals")isonly0.1percent. Hydrogeninthecoreofthesunisconvertedintohelium,which isslowtochange. Theouterlayerofthesunhasadifferentspincycle:25.4days ontheequatorandaweek'srotation;Thepolesareupto36 ...
根据父亲所说的内容(Dad said, "T here are elements like oxygen (O), nitrogen (N) , helium (He), and others. T hey mix to make carbon diozide (CO 2) , carbon monoride (CO) , and other things. "爸爸说:“这里有氧(0)、氮(N)、氦(He)等元素。他们不能制造二氧化碳(CO 2)、一...
firstmajorliveeventsince2012.Called Ascension,thestunt(特技表演)involvedBlaineattachinghimselfto52colorfulhelium balloonsand goinguphighintotheclearblueskiesabovethe GreatBasinDesert. “Iwanttogoupandbecomeatinyspotin thesky,”theadventurertoldtheNowYorkPost priortotheevent.Theadventurerachievedhis goalbygoingup...
Every substance in the world is made of“chemicals”, either in the form of chemical compounds in which atoms are linked by chemical bonds or, in a few cases such as helium gas, as unlinked atoms. No substances can be called“chemical-free”. Indeed,“natural”chemicals do not always ...
Although it is very thin, the moon does have an atmosphere. The composition is not well known, but it is estimated to consist of helium, neon, hydrogen (H2), argon, neon, methane, ammonia, andcarbon dioxide, with trace amounts of oxygen, aluminum, silicon, phosphorus, sodium, and magnes...