Exam 18: The Universe

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

Twelve hours of daytime and twelve hours of nighttime occur at every location on Earth whenever the Sun reaches the

The apparent path that the Sun traces annually along the celestial sphere is called the

The value for the total energy that reaches each square meter of Earth from the Sun each second is called the ______________.

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

A star of magnitude 3 is how many times brighter than a star of magnitude 5?

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

The cataclysmic explosion of a star that throws most of its matter into space is called a(n) ______________.

The Sun is

The letters LMC refer to the galaxy named ______________.

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