Stars are made up of mostly hydrogen and helium. These two gasses comprise most of the universe, and formed some 300,000 years after the big bang, after matter decoupled from the electromagnetic force and the temperature of the universe had sufficiently cooled.
It is currently believed that at the creation of the universe, the universe consisted of only the lighter elements of Hydrogen and Helium.
Gravity brought groups of those atoms together, and they formed stars.
They nuclear reactions of stars, and their life cycles, produce the heavier elements on the Periodic Table.
When a star is "born" it will have about 80% hydrogen and 20% helium. For most of a stars life, it is converting hydrogen into helium, the excess given off as energy, so as the hydrogen depletes, the amount of helium increases.
Once all of the hydrogen has been used up, the star comes out of the main sequence phase and starts converting helium into carbon and oxygen.
So for 99% of a stars life it does have more hydrogen than helium, but in the last stages, it does not.
It all depends on the definition of a star.
In sensible terms, as we like to call them, then yes. Purist astronomers would disagree as there are many other types of star, some which don't have hydrogen or helium.
However, all stars that you can see, and the other billions - you can't all have about 75% hydrogen and 25% helium.
Stars are not mostly made of nitrogen and oxygen but rather helium and hydrogen. These gases are are constantly burning which produces massive amounts of heat and light which can be seen from billions of miles away.
The four outer gas giant planets;
Jupiter, Saturn, Uranus and Neptune.
No. Stars are made mostly of hydrogen and helium.
yes
Yes
All stars fuse hydrogen into helium - the slight difference in atomic weight between 4 hydrogen atoms and one helium atom, is given off as radiation.
Oops ! No. The statement is going along pretty good until the end.The star actually fuses hydrogen into helium .
All stars are comprised of around 98% hydrogen and helium, of which approximately 3/4 is hydrogen.This is also true of all the matter in the universe as a whole.While stars contain some amount of pretty much every element, they are made primarily of hydrogen and helium.
In our solar system both the gas giants Jupiter and Saturn, and the ice giants Uranus and Neptune (sometimes also called gas giants) are believed to have rocky cores, likely composed of silicates, ice, and possibly heavier elements like metals such as nickel/iron although their true composition is not well known. Above that are deep layers of metallic hydrogen. Their atmospheres are predominatly molecular hydrogen and some helium, with other compounds such as ammonia present in small amounts on Saturn. The ice giants Uranus and Neptune are so named for having much more icy compounds such as water, ammonia, and methane, and some nitrogen and hydrocarbons. The presence of methane in outer layers is thought to give Neptune its blue color.
The scientific answer: True. The sun formed about 4.6 billion years ago when a cloud composed primarily of hydrogen and helium with some heavier elements collapsed, igniting nuclear fusion. The creationist answer: False. On the first day God said let their be light. Genesis 1:3
True. The Sun is mainly composed of hydrogen (about 74% of its mass) and helium (about 24% of its mass). The remaining 2% consists of trace amounts of heavier elements.
True. Jupiter is consisted of mainly hydrogen and helium. 90% hydrogen, 8% helium and 2% other gases
8=D True
True
All stars fuse hydrogen into helium - the slight difference in atomic weight between 4 hydrogen atoms and one helium atom, is given off as radiation.
yes it is true
It Is Mostly made out of water because it has a lot of gas, helium, hydrogen, and methane. the percentages are ... 80% of hydrogen, 19% of helium, and 1.5% of gas.
False. A star is born when hydrogen starts to fuse into helium.
False.
They are composed mostly of liquid water
Oops ! No. The statement is going along pretty good until the end.The star actually fuses hydrogen into helium .
mostly water