Elliptical galaxies contain new stars. Question 68 options: Question 69 (1 point

Question

Elliptical galaxies contain new stars.

Question 68 options:

Question 69 (1 point)

The Earth precesses once every 100,000 years.

Question 69 options:

Question 70 (1 point)

Emission lines are produced by electrons falling from higher energy levels to lower energy levels.

Question 70 options:

Question 71 (1 point)

Variable stars can be used to find the distance to galaxies.

Question 71 options:

Question 72 (1 point)

Intracluster gas is cool.

Question 72 options:

Question 73 (1 point)

A star with a mass of about that of our Sun will form a planetary nebula and white dwarf when it dies.

Question 73 options:

Question 74 (1 point)

The surface of the Sun vibrates and oscillates like a bell.

Question 74 options:

Question 75 (1 point)

Solar minimum means that there are few sunspots on the Sun.

Question 75 options:

Question 76 (1 point)

A degree is larger than 30 arc minutes.

Question 76 options:

Question 77 (1 point)

Modern, scientific theories do not need to be testable.

Question 77 options:

Question 78 (1 point)

The temperature of the photosphere of the Sun is about 5800 K.

Question 78 options:

Explanation / Answer

68) False,  Elliptical galaxies contain many older stars, up to one trillion, but little dust and other interstellar matter.

69) Apsidal precession happens every 100,000 years, the path of earth's revolution changes. Axial precession happens once every 26,000 years, clockwise movement of the axis, the north pole points at Vega. Obliquity precession happens once every 41,000 years, refers to the angle of the earth.

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