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Question 1

Nebula

Answer 1

a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter

Question 2

Solar Nebula

Answer 2

Our solar system began forming within a concentration of interstellar dust and hydrogen gas called a molecular cloud

Question 3

Nuclear Fusion

Answer 3

a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy

Question 4

Sunspot

Answer 4

unspots are temporary phenomena on the Sun’s photosphere that appear as spots darker than the surrounding areas

Question 5

terrestrial planets

Answer 5

Within the Solar System, the terrestrial planets are the inner planets closest to the Sun

Question 6

Prograde Rotation

Answer 6

Having a rotational or orbital movement that is the same as most bodies within a celestial system

Question 7

retrograde rotation

Answer 7

All eight planets in the Solar System orbit the Sun in the direction of the Sun’s rotation

Question 8

Gas Giant

Answer 8

a large planet of relatively low density consisting predominantly of hydrogen and helium, such as Jupiter, Saturn, Uranus, or Neptune

Question 9

Satellite

Answer 9

an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication

Question 10

New Moon

Answer 10

the phase of the moon when it is in conjunction with the sun and invisible from earth, or shortly thereafter when it appears as a slender crescent

Question 11

Waxing Crescent

Answer 11

The moon is less than one-half illuminated by the sun but less than one quarter illuminated

Question 12

1st Quarter Moon

Answer 12

The First Quarter Moon is a primary Moon phase when we can see exactly half of the Moon’s surface illuminated

Question 13

Waxing Gibbous

Answer 13

Gibbous refers to the shape, which is less than the full circle of a Full Moon, but larger than the semicircle shape of the Moon at Third Quarter

Question 14

Full Moon

Answer 14

he phase of the moon in which its whole disk is illuminated

Question 15

Waning Gibbous

Answer 15

Waning means that it is getting smaller. Gibbous refers to the shape, which is less than the full circle of a Full Moon, but larger than the semicircle shape of the Third Quarter Moon

Question 16

Last Quarter Moon

Answer 16

hird Quarter. The moon is one-half illuminated by the sun. Occurs when the moon’s illumination is decreasing, Waning Crescent

Question 17

Waning Crescent

Answer 17

The Moon appears to be partly but less than one-half illuminated by direct sunlight

Question 18

Solar Eclipse

Answer 18

an eclipse in which the sun is obscured by the moon

Question 19

Lunar Eclipse

Answer 19

an eclipse in which the moon appears darkened as it passes into the earth’s shadow

Question 20

Comet

Answer 20

a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun

Question 21

Asteroid

Answer 21

small rocky body orbiting the sun. Large numbers of these, ranging in size from nearly 600 miles (1,000 km) across (Ceres) to dust particles

Question 22

Asteroid Belt

Answer 22

he asteroid belt is a region of space between the orbits of Mars and Jupiter where most of the asteroids in our Solar System

Question 23

Meteoroid

Answer 23

a small body moving in the solar system that would become a meteor if it entered the earth’s atmosphere

Question 24

Meteorite

Answer 24

a meteor that survives its passage through the earth’s atmosphere such that part of it strikes the ground. More than 90 percent of meteorites are of rock, while the remainder consist wholly or partly of iron and nickel

Question 25

Meteor

Answer 25

a small body of matter from outer space that enters the earth’s atmosphere, becoming incandescent as a result of friction and appearing as a streak of light