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ASTR109 The Cosmos: Birth & Evolution - Canterbury Uni 2022S1 > W8 L2 - > Flashcards

W8 L2 - Flashcards

1
Q

What is the size limit for Earth-like life?

A

About 2 Earth radii

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2
Q

How can a planet recycle nutrients onto its surface for life to use?

A

Plate tectonics

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3
Q

What might a planet need to protect itself from solar storms?

A

Magnetic fields

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4
Q

Why might large stars not be a good place for an Earth-like planet to develop life?

A

Large stars have a short lifetime

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5
Q

What is the risk of being close to a small star?

A

Solar flares and radiation

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6
Q

How many Earth-like planets were found around Trappist-1?

A

Seven!!

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7
Q

What is the name for balance in a star?

A

Hydrostatic equilibrium

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8
Q

What is the name for the substance in starts where electrons have been stripped?

A

Plasma

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9
Q

What part of the sun do we see in a total eclipse?

A

The corona

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10
Q

What are the letter types of stars from hottest to coolest?

A

O B A F G K M

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11
Q

What is the mnemonic for star category types?

A

Oh be a fine girl kiss me (or guy, or non-binary individual)

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12
Q

What diagram is used to categorise stars?

A

The Hertzsprung-Russell diagram

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13
Q

What does the HR-diagram have on its axes?

A

Vertical = brightness cf Sun; horizontal = T(K) from hot to cool

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14
Q

How much bigger than the sun is the largest known star?

A

2,000 times bigger than the Sun

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15
Q

Why do M dwarf stars have strong magnetic fields?

A

There is a lot of plasma moving in the convective zone

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16
Q

What is a downside of being close to a M dwarf star?

A

Frequent solar flares due to tangled magnetic flares

17
Q

In FGK stars how big are the radiative and convective zones compared with each other

A

Similar in size

18
Q

What happens as FGK stars heat up?

A

The radiative zones gets bigger and the convective smaller

19
Q

How big is the radiative zone in OBA stars compared with the convective zone?

A

Very large

20
Q

How long do OBA stars last?

A

Tens of millions of years

21
Q

What kinds of stars are on the instability strip?

A

Variable stars

22
Q

What element gets double ionised in a variable star on the instability strip?

A

Helium in an ionised helium layer

23
Q

What is the difference in the size of radiative and convective zones in O stars vs M stars?

A

O have very large radiative zones, M have very large convective zones

ASTR109 The Cosmos: Birth & Evolution - Canterbury Uni 2022S1 (17 decks)

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