UNIT 1 Review - Space Science - 7th Grade - Isabella/Alex
white dwarf
A small, hot, dim star that is the leftover center of an old star
What is a terrestrial planet?
A smaller, dense, rocky planet.
neutron star
A star that has collapsed under its own gravity
universe
All of space and everything in it
supernova
A gigantic explosion in which a massive star collapses and throws its outer layers into space
Mizar is a star system that is composed of of two pairs of stars, Mizar A and Mizar B, or four stars in total. What to astronomers call a system that is composed of mored than two stars?
A multiple star system
a diagonal area on an H-R diagram that includes more than 90 percent of all stars
main seqence
a life-cycle stage of stars
main sequence
a large cloud of gas and dust in space
nebula
A large body in space that orbits a star and does not produce light of its own
planet
The color of a star can be used to determine temperature. Which color of a star is the coolest?
red
...consists of one star or more than one star and all the objects in orbit around the central star
solar system
solar system sun, planets, and all the other objects that revolve around the sun
solar system
Large celestial body composed of gas that emits light
star
luminosity
the true brightness of an object
the hot, dense core of matter that remains from the collapse of a low-mass star
white dwarf
A star has a size of 0.1 solar radius. How many times larger is the sun than this star?
10 times larger than the star.
How does the size of the sun compare to the size of other stars?
Average
How is the structure of the universe compared to soap bubbles?
Because there are large voids between the areas of matter in the universe.
Where is Earth in the solar system?
Earth is the third planet from the sun
Our sun is one of the more massive stars in our galaxy.
False
Stars develope from white dwarves.
False
How many gas planets are in our solar system?
Four
How do galaxies range in size?
From dwarf galaxies with approximately 1 million stars to giant galaxies with more than 1 trillion stars
H-R diagram
Hertzsprung-Russell diagram, a graph that shows the relationship between a star's surface temperature and absolute magnitude
absolute magnitude
The actual brightness of a star
What causes a supernova?
The collapse of the core of a high-mass star
While planets are smaller than stars, planets are generally larger than which of the following...
The other bodies in the solar system
A neutron star is a extremely dense ball of neutrons
True
The sun has a surface temperature of approximately 5,527 degrees Celsius. What is the color of the sun?
Yellow
Which is a hotter star? Red or Yellow?
Yellow
star
a fixed luminous point in the night sky that is a large, remote incandescent body like the sun.
the brightness of a star as seen from Earth
apparent magnitude
How do astronomers measure the brightness of a star?
by using apparent magnitude
...is a large group of stars, gas, and dust held together by gravity
galaxy
A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity
galaxy
Where do stars form?
inside a nebula
