Question

which statements describe properties of stars? check all that apply. stars produce energy through nuclear fusion stars produce energy through gravity stars are massive objects composed of gas. stars are solid objects that we could stand on. stars are composed primarily of hydrogen and helium. stars are composed primarily of liquids such as water.

Explanation:

• Nuclear fusion occurs in stars (e.g., hydrogen - to - helium fusion in the Sun), so "Stars produce energy through nuclear fusion" is correct.
• Gravity is a force in stars (e.g., gravitational equilibrium), but it doesn't produce energy in the sense of a power - generating mechanism like nuclear fusion. So "Stars produce energy through gravity" is incorrect.
• Stars are large (massive) and made of gas (plasma, which is a state of gas - like matter with free ions and electrons). So "Stars are massive objects composed of gas" is correct.
• Stars are not solid (except for some remnants like white dwarfs in a different state, but main - sequence stars are not solid). So "Stars are solid objects that we could stand on" is incorrect.
• Stars (especially main - sequence stars) are mainly hydrogen (about 70 - 75% by mass) and helium (about 24 - 28% by mass). So "Stars are composed primarily of hydrogen and helium" is correct.
• Stars are not composed mainly of liquids like water. So "Stars are composed primarily of liquids such as water" is incorrect.

Answer:

Stars produce energy through nuclear fusion, Stars are massive objects composed of gas, Stars are composed primarily of hydrogen and helium.