From When Stars Explode R.I. 1.2

Part A -What are TWO main ideas of the article by Ken Croswell?

• Supernovae are violent explosions of stars.

• Astronomers did not always use telescopes.

• Astronomers can see supernovae for months.

• Stars make energy through nuclear reactions.

• Stars produce light that travels across the universe.

Part B -Which TWO sentences from the article best support the answer to Part A?

• "The last time people saw a supernovae in our galaxy was 1604".

• "That was before astronomers were using telescopes".

• "Such a star is born with a mass of over eight times the sun".

• "Its center makes energy the same way the Sun does: by changing hydrogen, the lightest element into helium, the second-lightest element.

• "If a supernovae occurred within a few dozen light-years of Earth, we would be in trouble".

Which sentence is one main idea of the article?

• In 1604 , a supernovae exploded.

• Supernovae make important elements.

• Astronomers did not always use telescopes.

Which sentence is a supporting detail of that main idea?

• "And the explosions themselves produce iron".

• "The outflow of huge amounts of energy-much of light-pushes outward from the star's center".

• "This nuclear reaction creates energy that heats the star and makes it shine".

Which sentence is another main idea of the article?

• Antares is a massive star.

• Only some stars will become supernovae.

• Hydrogen is the lightest element.

Which sentence is a supporting detail to that main idea?

• "The last time people saw a supernovae in our galaxy was 1604".

• "However, every year astronomers see supernovae exploding in other galaxies".

• "The Sun will never explode".

Read the following sentence from the text.

But as long as the star can make energy, it can fight the force of gravity and survive.

Which definition best defines energy?

• physical strength

• hydrogen and helium gas

• heavy metals that increase weight

• power that comes from heat

Why is Antares called a massive star?

• It is hot, bright, and blue.

• It is more than eight times the mass of the sun

• It can fight the force of gravity.

What i the distance that light speeds through in one year?

• 6 trillion miles

• 4 trillion miles

• 10,000 miles

• 10 miles

Would we exist without supernovae?

• YEs

• No