Question

What are stars? Answer in 2-4 sentences, including the words below:

Nebula

Hydrogen gas

Size

Color

Answer 1

Answer: A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth.

Answer 2

Stars are celestial bodies that form from the gravitational collapse of a nebula, a cloud of gas and dust in space. They are primarily composed of hydrogen gas, which undergoes fusion in their cores to release energy in the form of light and heat. The size and color of stars vary depending on their mass and age, with larger stars typically being hotter and more luminous, and smaller stars being cooler and less luminous.