6.Why is the star IK Pegasi not a threat to life on Earth? Select one: a. The Su

Question

6.Why is the star IK Pegasi not a threat to life on Earth?

Select one:

a. The Sun-like star in IK Pegasi is still fusing hydrogen. It will be at 1-2 billion years before it evolves into a red giant, allowing the white dwarf to capture mass and exceed the 1.4 MSun mass limit.

b. IK Pegasi is a binary system with a white dwarf and a Sun-like star. Only massive stars explode in supernovas.

17.In case of a nearby GRB, a lethal dose of which subatomic particle could cause the death of up to half the living creatures on Earth?

Select one:

a. positrons (anti-matter)

b. muons (heavy electrons)

c. protons

Explanation / Answer

6 - b

17 - a

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