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Science > Science Ch 16 Lesson 2 TEST > Flashcards

Science Ch 16 Lesson 2 TEST Flashcards

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1
Q

What are stars and what do they give off?

A

Thet are giganticballs of very hot gasses that give off electromagnetic rediation

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2
Q

What is the Sun and what size is it?

A

The Sun is a star and it is medium is size

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3
Q

how large can supergiants stars be?

A

Super giants can be 300 times larger than the sun

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4
Q

What energy does the sun give off?

A

The sun gives off thermal energy and light energy

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5
Q

Where does the sun’s energy come from?

A

The suns energy comes from the fusion of hydrogen atoms into helium atoms

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6
Q

What is the closest star to Earth?

A

The Sun

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7
Q

What is the brightest star in the sky?

A

The sun

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8
Q

The sun has…?

A

No hard surfaces

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9
Q

What are the sun’s 3 layers?

A

Photosphere, chromosphere, and the corona

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10
Q

What is the Photosphere?

Where is it located?

A

The photosphere is the part of the sun that gives off the light energy. It is the photosphere that is responsible for us seeing bright, sunny days. It is also the inner-most layer of the suns atmosphere.

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11
Q

What is the chromosphere?
What does that layer give us?
How can you see this layer and what does it look like?

A

The chromosphere is the layer above the photosphere. This layer gives us (Earth) warmth. You can only see this layer during a solar eclipse and while wearing some heavy duty eye protection. If you look at the surface its edges are ragged.

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12
Q

What is the corona And what happens here?

A

The corona is the outer most layer of the sun. Solar wind happens here.

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13
Q

What are sun spots and where do they occur?

A

Sunspots occur in the photosphere. They are dark spots that are lower in temperature on the sun.

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14
Q

What is Prominences what part of the sun does it come from?

A

Promises are RIBBONS of glowing gas coming off the corona. Linked to the sunspot cycle

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15
Q

What are solar flares? And where do they occur?
What is released when they occur?
What can happen on earth as a result? 
What is it linked to?

A

A sudden, brief volcanic eruption in the chromosphere which releases solar magnetic energy. It can disrupt radio communications and electrical systems on earth. This is also linked to the sunspot cycle.

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16
Q

How long does it take the light from the sun to reach to earth?

A

The light from the sun takes eight minutes to reach the earth. All the other stars are much farther away

17
Q

Scientist measure how far away the stars are in…?

A

Light - years

18
Q

What is a light year?

A

It is the distance light travels in one year.

19
Q

What is a stars brightness based on?

A

It is based on the distance, size, temperature, and the amount of energy it gives off. Brightest stars give off the most energy

20
Q

What do the brightest stars give off?

A

They give off the most energy

21
Q

What is the 3rd Most closest star to earth?

A

The third closest star to earth is the Barrnard’s star

22
Q

Why can we not see the Barnards star without a telescope?

A

We cannot see it without a telescope because it is not very hot

23
Q

Sirius Star is ____________ from the earth.

Also why can it be seen?

A

Far away. It could be seen because it is very hot.

24
Q

What is the brightest star in the sky?

A

The Sirius Star

25
Q

What does the color and temperature of a star tell us? give some ex…

A

It tells us how hot a star is.
Ex:
 Red (like Barnard star) is cool. Yellow (like the sun) is medium. Blue/white (like the Sirius star) is the hottest 

26
Q

What is a nebula?

A

A new star that is formed in a cloud of gas and dust.

27
Q

How are stars made?

A

Gravity pulls particles together into a ball and then temperature rises. These particles become a star

28
Q

Stars lived a long time, but not forever how can you tell when a star is going to die?

A

When a red and yellow stars dying, they become white dwarf stars. Then white dwarf stars run out of fuel, and become black dwarf stars. When stars are about to die they run out of fuel and go out in blaze of glory! Then a gigantic explosion happens called a super nova.

29
Q

What do supernovas do?

A

Supernovas hurl matter and energy into space

30
Q

What is a Black hole?

How is it formed?

A

It is a point in space that has such a strong force of gravity that nothing can escape, not even light. When the core of a star is quite massive, the cores gravity will keep causing it to shrink until it becomes a black hole.

31
Q

What occurs inside The chromosphere

A

Huge magnetic storms occurs within the chromosphere

32
Q

What is the corona known as?

How do you see the corona?

A

The coronas is known as the sun’s crown. You can only see the corona with specialized equipment or during a total solar eclipse

33
Q

How often do sunspots change?

A

The number of sunspots changes every 11 years.

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