UNIT 1 Review - Space Science - 7th Grade - Isabella/Alex

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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


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