Science

The greatest proportion of elements in the universe are those with the smallest masses.

True

The shaded area of the graph correctly represnts the percentage of stars that are in the main sequence of HR diagram.

True

The state of matter found in the sun's interior is plasma.

True

The sun is almost entirely composed of hydrogen and helium.

True

What causes the dark bands observed in a solar spectrum?

Different chemical elements which absorb light at specific wavelenghts.

A star that is gravitationally bound to another star can either be part of a star cluster or a ..... star.

Binary

Scientists gather evidence about the sun's composition by directly sampling material from the sun.

False

Stars more massive than the sun use up their fuel at a slower rate.

False

The corona is visible only during eclipses because it is the coolest layer of the sun's atmosphere.

False

The..... of a star determines its temperature, luminosity, and diameter.

Mass

The apparent shift in a star's position casued by the motion of the observer is called.....?

Parallax

Which planet has composition and density most similar to the sun?

Saturn

Which correctly lists objects in order of decreasing mass?

Solar system, sun, Jupiter, Earth

A parsec is a greater distance than a light year.

True

When hydrogen nuclei fuse, they produce helium.

True

A scientist using parallax to determine the distance to a star will notice the greatest shift in a star's apparent position when measured .......

at 6 months intervals