Question

what is a nebula? a an area in space where no stars exist. b radiation that exists throughout the universe. c a small cloud of hydrogen that forms when a star explodes. d a large cloud of dust and gas from which the sun, planets, and other solar sy

Explanation:

A nebula is a large interstellar cloud of dust, hydrogen, helium and other ionized gases. Stars and planets can form from nebulae. Option A is incorrect as stars can form within nebulae. Option B is wrong as nebulae are not radiation. Option C is inaccurate as nebulae are not just small hydrogen - clouds from star explosions (though some nebulae are formed that way, but they are not small in general). Option D correctly describes a nebula as a large cloud of dust and gas from which celestial bodies can form.

Answer:

D. A large cloud of dust and gas from which the Sun, planets, and other solar system bodies can form.