Exam 18: The Universe

The stars of highest photospheric temperature are those of spectral class ______________.

The closest star to the Sun is named

The heliosphere is defined as the volume of space over which the ______________ extends.

Familiar groups of stars that are part of a constellation or parts of different constellations are called ______________.

Proxima Centauri,the nearest star to the Sun,exhibits an annual parallax of 0.76 arcsec.Determine the distance to Proxima Centauri in parsecs.

It is not true that right ascension is

What spectral class of star fits between a type G and a type M?

Determine the distance to Proxima Centauri in light-years,if it is 1.3 pc away.

Stars in the process of forming are called

The visible surface of the Sun is called the ______________.

Stars of what magnitude are just barely visible to the unaided eye?

A Type II supernova can form a _______________ or a black hole.

Polaris,the pole star,is 208 parsecs away.Calculate the distance to Polaris in kilometers.

The Sun is a(n)

A point in the universe where the density of matter and the gravitational field are theoretically infinite is called a(n)______________.

The stellar parallax of many stars is too small to be measured.This is evidence that these stars

The most distant objects yet detected in the universe are

Calculate the distance to the Sun in light-minutes.

Six trillion miles is equivalent in distance to one ______________.

One ______________ is defined as the distance to a star when the star exhibits a parallax of one second of arc.