Origin and Evolution of the Universe — Unit test

Question 1

The chart shows characteristics of stars.Sirius is a blue-white star with a surface temperature of about 9800 K.What is most likely the mass of Sirius?

Revolt · Accepted Answer

2.0 solar mass

Question 2

The presence of which element would indicate that a star is going through a high-mass star life cycle as opposed to a low-mass star life cycle?

Revolt · Accepted Answer

iron

Question 3

Which describes redshifts? Check all that apply.

Revolt · Accepted Answer

Observed light shifts to a longer wavelength.; They indicate receding galaxies.; The light source and observer move farther apart.

Question 4

Daniel observed and compared some stars at night and recorded his observations in a chart.Daniel later discovered that star X is farther away from Earth than the other stars he observed, and star Z is closest to Earth.

Revolt · Accepted Answer

Star X is more luminous than both stars Y and Z.

Question 5

Which best describes cosmic microwave background radiation?

Revolt · Accepted Answer

leftover radiation from the big bang

Question 6

Alana drew a diagram to compare the life cycles of low-mass and high-mass stars.

Revolt · Accepted Answer

X: A white dwarf is part of the cycle.Y: Nuclear fusion forms hydrogen in the main sequence star.Z: A supernova is part of the cycle.

Origin and Evolution of the Universe — Unit test Answers

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