Chapter 3

Directions: Complete the following sentences with the correct word or words.

1.             1.   A range of colors formed when white light passes through a prism is called a ________.
2.             2.   Both reflecting and refracting telescopes are designed to gather and focus _______________ light.
3.             3.   Reflecting telescopes differ from refracting telescopes in having a ______________ instead of an objective lens.
4.             4.   A __________________ is the distance light travels in a year.
5.             5.   Characteristics used to classify stars include ____________, ____________________, and ____________________________.
6.             6.   On the H-R diagram, ______________ stars are classified as the coolest color of stars.
7.             7.   A star is born when __________________ fusion starts.
8.             8.   The lifetime of a star depends on its_________________.
9.             9.   A supernova is the explosion of a dying ________________________ star.
10.           10.   More than half of all stars are members of groups of two or more stars called ___________________________.
11.           11.   Eclipsing binary stars can sometimes be identified because they become __________________ at regular intervals.
12.           12.   Elliptical galaxies have almost no _____________ or ______________ between the stars.
13.           13.   The Milky Way galaxy is an example of a(n) ______________________ galaxy.
14.           14.   The theory that astronomers have developed to describe the formation of the universe is called the ________________________ theory
15.           15.   The solar system formed from a giant cloud of gas and dust, known as a ___________.
16.            16.   The _____________________ magnitude of a star depends on its size and temperature.
17.           17.   The Hertzsprung-Russell diagram shows that ______________________ stars increase in brightness as they increase in temperature.
18.           18.   To get a clearer image, large optical telescopes are located on mountains so that they are above part of the ______________________.
19.           19.   Radio waves have ______________________ wavelengths than waves of visible light.
20.           20.   A _____________________ telescope uses a mirror to focus light onto a small area.
21.           21.   Most galaxies are currently moving _________________ from each other.
22.           22.   Astronomers typically measure distances to stars in units called __________________.
23.           23.   The brightness of a star as seen from Earth is its ____________________ brightness.
24.           24.   The remains of a star that has no fuel but glows faintly is a _________________ dwarf.
25.           25.   Stars with less mass will last ___________________ than stars with more mass.
26.           26.   A star system has at least _______________ stars.
27.           27.   The sun is part of The ________________________ Galaxy.
28.           28.   A star’s _______________ determines whether it becomes a neutron star or Black hole.
29.           29.   The sun eventually become a ______________________ at the end of its life.
30.           30.   A _________________ is the earliest stage in a stars life.