Question

1. what is a supernova?

a) a newborn star
c) a massive explosion of a dying star
b) a giant gas planet
d) a bright meteor shower

1. what are the two elements that make up about 98% of the suns composition?

a) oxygen and carbon
c) hydrogen and nitrogen
b) hydrogen and helium
d) helium and lithium

1. from what do all stars form?

a) moons and planets
c) super-heated dust and gas (nebula)
b) solar wind
d) light particles (photons)

Explanation:

• A supernova is a massive explosion of a dying star. Newborn stars are called protostars (eliminating A). A giant gas planet is a type of planet (eliminating B). A meteor shower is related to meteors, not stellar explosions (eliminating D).
• The Sun is mainly composed of hydrogen (about 73%) and helium (about 25%), which together make up about 98% of its composition. Oxygen and carbon are minor components (eliminating A). Nitrogen is not a major component (eliminating C). Lithium is a trace element (eliminating D).
• All stars form from super - heated dust and gas (a nebula). Moons and planets do not form stars (eliminating A). Solar wind is a stream of charged particles from the Sun (eliminating B). Light particles (photons) are not the building blocks of stars (eliminating D).

Answer:

1. C) A massive explosion of a dying star
2. B) Hydrogen and helium
3. C) Super - heated dust and gas (nebula)