Is it true that the sun is composed mostly of hydrogen and helium?

Answer 1

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.

Answer 2

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.

Answer 3

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.

Answer 4

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.

Answer 5

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.

Answer 6

The four outer gas giant planets;

Jupiter, Saturn, Uranus and Neptune.

Answer 7

No. Stars are made mostly of hydrogen and helium.

Answer 8

yes

Answer 9

Yes