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82 Cards in this Set

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A _______ is described as a giant dirty snowball. It is composed of frozen gases, water,______ and icy lumps.
comet, dust
A distinguishing feature of Jupiter is _____ _______ ______ Spot. This spot is a giant storm that is 30,000 miles long and _______ miles wide.
The Giant Red, 10,000
________ is a region beyond the Earth’s atmosphere where there is very little molecular activity.
space
Many people generally agree that space occurs at about _____ miles outward from Earth.
250
The _________ includes everything, stars, planets, galaxies, animals, plants and humans.
universe
Space is characterized by a lack of __________.
oxygen
Small or low gravity is called ______________.
microgravity
Our sun, which is the center of our solar system, is but a tiny spot in our _________. In fact, there are 200 billion _____ in our galaxy, and our galaxy is just one of millions of galaxies.
galaxy, suns
A _________ is an enormous collection of stars, and these stars are arranged in a particular shape.
galaxy
The three main shapes of galaxies are _________, _________ and __________.
elliptical, spiral and irregular
Elliptical galaxy is oval shaped. _________ galaxy has arms spiraling outward from a center. _________ galaxy has no particular shape.
spiral, irregular
Our galaxy is called the ________ ______. It is ________ shaped.
Milky Way, spiral
Galaxies contain giant clouds of gas and dust called ___________.
Nebulae
_________ are bodies of hot gases.
Stars
The _______________ is a part of the atmosphere divided by its electrical activity.
Ionosphere
The ______ is the primary cause of the Van Allen belts.
Sun
Most stars are composed of __________ and ________ in their gaseous state.
hydrogen and helium
About half of all stars come in pairs with the stars sharing the same gravitational center. These are called _________ stars.
binary
A ___________ is a grouping of stars that look like imaginary figures.
constellation
The Big Dipper is an example of a ______________.
constellation
Our _______ _______ is the sun and the bodies that orbit around it.
solar system
Without heat and light, the Earth would be a lifeless, _____-_________ planet.
ice-covered
The central star of our solar system is the _______.
sun
The Earth is _____ _________ miles from the sun.
93 million
The sun is composed of about ____% hydrogen, ___% helium and minor amounts of several other elements.
90, 9
The temperature of the sun ranges from ______degrees C in its coolest regions to over ____ _______ degrees C at its center.
4200, 15 million
_________ are darker, cooler areas of the sun.
sunspots
_______ _______ are short-lived high-energy discharges.
solar flares
_______ _____________ are larger and longer lasting high-energy discharges.
solar prominences
The Earth’s Moon has a diameter of about ______ miles, which is about ___ of the Earth’s diameter.
2155, ¼
The distance from the Earth to the Moon varies from approximately ______ miles at its farthest point to ________ miles at its nearest point.
252,000 221,000
The Moon rotates on its axis in the same amount of time it takes to orbit the Earth, _______ days. Therefore, the same side of the Moon, the near side, always faces the Earth.
27
When the Moon is on the side of the Earth nearer the sun, the Moon is ______.
new
When it is on the opposite side of the Earth, the Moon is _______.
full
Primarily, the Moon has two types of terrain, ___________ and ___________.
highlands lowlands
Temperatures on the Moon range from about _____degrees in the day, to below ______degrees at night.
250, -250
___________ is the closest planet to the sun, and it revolves around the sun every _____ days.
Mercury, 88
_________ is the closest planet to Earth. It revolves around the sun in _____ days.
Venus, 225
Venus is the ________ planet in the solar system with temperatures in excess of _____degrees.
hottest, 850
__________is the only known planet to rotate in a clockwise manner.
Venus
The atmosphere of Venus is 96% _________ __________ and 4% nitrogen.
carbon dioxide
The Earth’s atmosphere contains 78% ___________ and 21% ____________.
nitrogen, oxygen
The surface of our planet is covered with over 67% __________.
water
The Earth revolves around the sun in _______ days.
365
Mars is known as the _____ planet and even with the naked eye we can see this _______ color.
red, red
The red color of Mars is due to the ______ and _______ covering the surface.
rock, dust
The surface of Mars is covered with deserts, high mountains, deep craters and huge ____________.
volcanoes
One of Mars’ ____________ is the highest known mountain in our solar system.
volcanoes
The atmosphere of Mars consists of 95% _________ ___________.
carbon dioxide
Daytime temperatures on Mars reach ____degrees F, while nighttime temperatures can dip to______degrees F.
65, -130
In July 1997, the space probe called the ______ _____________ landed on Mars. The next day the rover, Sojourner Truth began its exploration of the planet. The rover was ____ feet long and _____ foot tall.
Pathfinder, two, one
Next to Earth, _______ has the most favorable conditions for life of any of the other planets in our solar system.
Mars
__________ is the largest planet in our solar system.
Jupiter
Jupiter is ____ times larger than Earth.
11
Jupiter is a gas giant, with ___________ accounting for about 90% of the atmosphere, followed by helium, __________ and ammonia.
hydrogen,methane
Jupiter is known for its ____ moons.
16
The rings are the most recognizable feature of ________.
Saturn
Saturn's rings are made of icy chunks of ______ ranging from tiny particles to large _________.
rock, boulders
Saturn's main rings are made up of hundreds of narrow __________.
Ringlets
Saturn's entire ring system is about one mile thick and extends about _________ miles from the planet.
250,000
Saturn has an _____ _____ core surrounded by metallic hydrogen with an outer layer of hydrogen and helium.
icy, rock
It takes Saturn ____ years to revolve around the sun.
29
The winds of Saturn have been known to reach ______ mph.
1100
Saturn is ____ _______ miles from the sun.
900 million
________, one of the moons of Saturn, is the only moon in the solar system to have its own ______________.
Titan, atmosphere
___________ is about 1.7 billion miles from the sun. It has a rocky core surrounded by water, ammonia and methane, in both ice and _________ form.
Uranus, liquid
Uranus revolves around the sun in ____ years.
84
Daylight on Uranus lasts for ___ years followed by ___ years of night.
42, 42
Uranus also has 11 very narrow and black ________ around it.
rings
Neptune is about ___ ________ miles from the sun and takes ____ Earth years to complete an orbit.
3 billion, 165
Neptune’s atmosphere consists of ___________, helium and __________.
hydrogen, methane
The ___________ gives Neptune a bluish color.
methane
___________ is the most windy planet in the solar system. It has recorded winds of _______ mph.
Neptune, 1340
________ is the smallest planet in our solar system. It is a dark and ________ planet.
Pluto, frozen
Pluto's surface is made up of __________ ________.
methane frost
Asteroids, comets and meteoroids are collectively thought of as _________ orbiting in space.
Debris
______________ are chunks of rock that range in size from particles of dust to some that are a few hundred miles across.
Asteroids
Most _______ travel in an orbit between Mars and Jupiter. This area is known as the ________ ______.
asteroids, asteroid belt
_______ are tiny particles of dust and sand that are usually leftover from a comet.
meteoroids
If a meteoroid enters the Earth’s atmosphere it is called a _______.
meteor
Meteors that actually hit the Earth are called ______________.
meteorites
Mercury's daytime temperature reaches_____degrees F, while its nighttime temperatures reach _____degrees F.
800, -300