Science 1095 Self-Test

A neutron star that emits a radio signal that appears to start and stop in a rhythmic patterns the star rapidly spins is called a.......

pulsar

The,.....have served as a map, helping sailors and travelers navigate from one location to another.

stars

If a giant or a supergiant star becomes unstable, it could cause a tremendous explosion called a.....,which may outshine a galaxy for a short time

super nova

A cluster is a multiple-star group containing.....or more stars

ten

The,.....Cluster,to which the members of the Local Group belong, is an example of a rich cluster because it contains more than 1,000 galaxies.

virgo

According to color, the order of the least hot stars to the hottest stars is red,....., blue-white

yellow

.....magnitude compares the brightness, or magnitude, stars would have if they were all the same distance, ten parsecs, from earth

Absolute

A starts size, energy output, and.....from Earth affect its apparent magnitude;therefore,the apparent magnitude may not include a star's brightness

distance

A/An,.....galaxy is circular or elongated and has no spiral pater

elliptical

A..... is the distance light travels in one year

light-year

Reflecting telescopes use a dish-shaped, or concave,.....to gather light from objects

mirror

Astronomers are able to determine the surface temperature of a star by its color and its.....

spectrum analysis

A.....star is a system of two stars in which one star revolves

binary

stars that are more than 20 times larger than the sol, earths sun, are considered to be......

giants

One of the main purposes God set the stars in the heavens was to declare the,.....of God.

glory

A refracting telescope uses a....to gather light from distant objects

lens

Today astronomers divide the sky into a grid using degrees, hours, minutes, and seconds pinpoint the exact.....of a particular star

location

A.....star is a system of three or more stars revolving around a common center of gravity

multiple

Astronomers sometimes use the....., which is equal to 3.26 light-years, as a unit of measurement to measure the immense distances in space

parsec

The nearest star system to our solar system is.....

Alpha Centauri

.....magnitude is the degree of brightness of an object as it is seen from earth

Apparent

Most of the apparent motion of heavenly bodies is due to.....rotation and not to the actual movement of the moon or stars

Earth's

.....devised a system to classify the stars he could see in the nighttime sky, and he labeled the brightest star a first-magnitude star

Hipparchus

The..... Space Telescope has enabled astronomers to see stars of the thirtieth magnitude

Hubble

The Andromeda, the,.....,and the Triangulum galaxies are the three largest members of the Local Group.

Milky Way

The constellation..... contains the red supergiant known as betelgeuse

Orion

.....are bright, radio-emitting objects that appear to be larger than any star but smaller than a galaxy.

Quasars

......make up about two-thirds of all the stars in our galaxy

Red dwarfs

A/An,.....galaxy has a spiral disk but no discernible arms.

S0

In theory a supernova could produce a neutron star so dense its gravitational field would not permit any energy to be emitted; such a star is called a.....

black hole

Most of the matter of the galaxy is concentrated in the galactic,.....

bulge

A galaxy with an elongated central bulge and spiral arms extending from the ends of the bar is a,.....galaxy.

barred spiral

A radio telescope consists of a concave,..... that collects radio waves from space and focuses them onto a. receiver, which changes the radio waves into electrical signals.

dish

Many astronomers believe the Milky Way is a barred spiral galaxy, and when viewed from the side, the galactic bulge and the,.....are the two main parts.

disk

An,.....galaxy is randomly shaped with no discernible appearance.

irregular

When a supernova dims, the gravity may condense the matter into a smaller, dense star, perhaps a white dwarf, a.....star, or even a black hole

neutron

When excess energy builds up inside a dwarf star and it explodes and hurls huge amounts of gas, dust, and energy into space, a ..... is formed

nova

Astronomers have discovered a means of measuring the distances to nearby stars by using.....

parallax

Our solar system is located in the Orion Spur of the,.....Arm of the Milky Way Galaxy.

sagittarius