WorksheetsEARTHSCIENCENEWREVIEW
Total questions: 50
Worksheet time: 31mins
The closest solar system to ours is called (a) .
What holds a galaxy together?
(a)
the biggest kind of black hole is called a (a) .
What are the three shapes of galaxies?
irregular, spiral, and elliptical
unusual, spiral, and eclipse
What force is working against gravity in keeping our galaxy from staying in one place?
G-force
Acceleration
Doppler shift
red shift
Our Sun will turn into a red giant in about_________years
10 billion
7 billion
10,000
17
Another name for a stellar nursery is a stellar (a)
Nuclear (a) is responsible for star formation
Baby stars are called (a) .
The two gases created to form stars are
(a)
mid-sized stars like ours eventually become (a) .
about how long does a supernovae explosion last?
(a)
Some neutron stars spin quickly, letting out pulses of radio waves. What are they called?
(a)
What are two things a massive star might end up as?
(a)
Based on its distance from the Sun, it's logical to assume that the average temperature on Mars is:
higher than the average temperature of Earth
lower than the average temperature of Earth
the same as the average temperature of Earth
Removing the tilt of Mars' axis of rotation would have what effect on its seasons?
there would be no seasons
the seasons would be more extreme
the number of seasons would double
the length of seasons would double
Water on Mars can be found most abundantly in which state of matter?
gas
liquid
semi-solid
solid
The Martian landscape most closely resembles which biome on Earth?
(a)
What factor has the greatest impact on the ability of the Martian atmosphere to retain heat?
the concentration of carbon dioxide in the air
the density of the atmosphere
the presence of iron oxide in the crust
the lack of liquid water on the surface
Why would the presence of canals on Mars indicate the existence of intelligent life?
canal buildings require advanced engineering skills
canals can be seen from Earth without a telescope
only intelligent life has need for transportation
the presence of liquid water guarantees the existence of intelligent life
Which of the following is an opinion about Mars?
establishing colonies on Mars is a risky idea
Mars has fascinated astronomers since ancient times
conditions on Mars are inhospitable to human life
significant amounts of water are located in Mars' North Pole
Which word best describes the Martian moons, Phobos and Deimos?
symmetrical
identical
negligible
irregular
Mars gets its red color from its ferrous soil. In the previous sentence, what does "ferrous" mean?
Rock-strewn
Colorful
Iron-rich
Clay-like
Which term best describes a stellar nursery?
A flaming ball of gas
A cloud of gas and dust
A cloud of thousands of small, young stars
A star system with planets and moons
What can you infer about the prefix "proto-?"
It means "last" or "after."
It means "infinite" or "everlasting."
It means "first" or "before."
It means "large" or "huge."
Place the following stages in the life of a low-mass star, like the sun, in order: A) Red giant; B) White dwarf; C) Main sequence star
C, A, B
A, C, B
B, A, C
B, C, A
Which of the following describes the process of nuclear fusion, as it occurs inside our sun?
Hydrogen and oxygen atoms combine to make water molecules.
Helium atoms split apart to form hydrogen atoms.
Water molecules break apart into hydrogen and oxygen atoms.
Hydrogen atoms combine to make helium atoms.
What effect does gravity have on stars?
It allows stars to break free of their galaxies
It helps break helium atoms apart inside of stars
It forms stars from clouds of gas and dust, and causes them to ignite
It causes stars to swell from white dwarfs to red giants
What effect does gravity have on stars?
It allows stars to break free of their galaxies
It helps break helium atoms apart inside of stars
It forms stars from clouds of gas and dust, and causes them to ignite
It causes stars to swell from white dwarfs to red giants
What is a supernova?
A type of black hole.
An incredibly dense but small star.
A star that is large and not dense.
The explosion of a large star.
How does a white dwarf compare to our sun as it exists now?
It has a similar mass, but is much denser.
It has a larger mass, but is less dense.
It has more mass, and is more dense.
It has less mass, and is less dense.
What will a star that's 1,000 times as massive as the sun ultimately become?
A white dwarf
A black hole
A planetary nebula
A red giant
How is a neutron star different from a regular star?
It emits electromagnetic pulses.
It has an almost infinite density.
It burns brighter than a galaxy with a billion stars.
It has less mass and greater gravity.
The light from a star moving away from us would be experiencing:
redshift
blueshift
greenshift
white shift
What force causes galaxies to move away from one another?
Electromagnetic force
gravity
friction
energy left over from the Big Bang
Which of the following happens before a black hole comes into existence?
Gravity ceases to exist in a certain region of space.
A new star is born at the center of a galaxy.
An old star collapses in on itself.
The fabric of spacetime is ripped by a star or planet.
Astronomers categorize galaxies into a handful of basic shapes. What can you conclude from this fact?
Galaxies all come from the same planetary nebula.
Galaxies are generally all formed by the same forces.
The number of stars in a galaxy determine its shape
All galaxies have about the same number of stars.
what can you conclude about dark matter?
It is made up of black holes
It holds a lot of the universe's mass
It's solid, not liquid or gaseous
Planet Earth contains trace fragments of it
How are elliptical galaxies different from spiral galaxies?
They contain older stars and less gas and dust.
They contain younger stars and more gas and dust.
They are bigger than spiral galaxies.
They are smaller than spiral galaxies.
What would happen to galaxies without gravity?
They would spin faster.
They would contain stronger black holes.
They would contain more stars.
They would fall apart.
Which of the following is a true statement about irregular galaxies?
They are older than other types of galaxies.
They all contain massive black holes at their centers.
They contain relatively little gas and dust.
They consist mainly of young stars.
Which of these measurements is closest to a light-year?
300 million meters
5 million kilometers
8 billion centimeters
10 trillion kilometers
Why is it so difficult to definitively prove the existence of alien life? Choose the best answer.
Alien life forms are hiding from humans
Today's spaceships aren't built for intergalactic travel
Alien microbes are too small to see without powerful microscopes
Aliens move too quickly for humans to detect
What's the best definition of a space alien?
Something that left Earth long ago and now lives in space
An intelligent being that resides on Mars
Any living organism that does not come from Earth
Water that's found on another planet
What is the most likely way that SETI would detect the existence of intelligent life?
Taking photographs of alien spacecraft
Translating alien languages
Identifying planets where life might exist
Intercepting radio messages sent by intelligent beings
If extraterrestrial life exists in our solar system, what form would it probably take?
small amphibians
bacteria
humanoids
reptiles
What can you infer from the fact that if extraterrestrial life exists, it will probably be near a star?
Stars contain helium atoms, which are the building blocks of life
Stars contain water, which is necessary for life
The Earth is near a star, and life can only exist on planets like Earth
Light and heat are necessary to sustain life
Which term best describes the process of exploring the universe for signs of intelligent life?
Fast-paced
Unscientific
time-consuming
hopeless
How might alien life be different than life on Earth?
It could include single-celled organisms
It could be based on different chemical elements
It could be made completely of light particles
It could require water to survive
What kind of proof would confirm the existence of extraterrestrial life?
Pictures of mysterious objects in the sky
Pieces of alien technology or clothing
Statements from people who swear they've seen UFOs
Hypotheses published by respected scientists
