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.Science Yr9 > Big Bang > Flashcards

Big Bang Flashcards

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1
Q

When did evrything first begin to appear (eath)

A

13.8 billion years ago

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2
Q

What is then name given to the massive explosion that started the universe

A

The Big bang

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3
Q

What happened in the first 3 minutes after the big bang

A

Protons and nuetrons formed

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4
Q

What did protons and neutrons combined to form (big bang)

A

Hydrogen,helium and lithium nuclei

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5
Q

What building blocks of life weren’t able to form after the big bang

A

Atoms

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6
Q

After how many years did the universe cool down

A

400 thousand years after the big bang

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7
Q

What type of radiation exsisted 400 thousand years ago

A

Cosmic microwave background radiation

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8
Q

After 9 billion years what formed

A

The solar system

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9
Q

What came from the solar system being created

A

Gravity,the sun,planets and asteroids and comets

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10
Q

How many years after the big bang did humans first appear

A

13.698

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11
Q

What do some scientist believe will happen near the big crunch

A

That the universe may slow down,it my stop expanding and that the universe may collapse on its self

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12
Q

What is the 1st planet in our solar system

A

Mercury

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13
Q

The 2nd planet in our solar system

A

Venus

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14
Q

The 3rd planet

A

Earth

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15
Q

The 4th

A

Mars

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16
Q

The 5th

A

Jupiter

17
Q

The 6th

A

Saturn

18
Q

The 7th

A

Uranus

19
Q

The 8th

A

Neptune

20
Q

What did people in india believe the world was being held up by

A

12 pillars

21
Q

What model has the earth in the middle

A

Geocentric model

22
Q

What is the retrograde motion

A

Where planets appear to go backwards

23
Q

What was the later and better model that was found (the model for all the planets with the sun in the middle)

A

The heliocentric model

24
Q

What does geocentric mean in greek

A

Earth at the centre

25
Q

What is the milky way doing

A

Moving away from us

26
Q

What do stars form in and what are they

A

A nebulae which are huge cloudsvof gas an dust

27
Q

Do stars last forever

A

No they don’t it mostly depends on the star’s size as changes happen to it over time

28
Q

What happens to bigger and small stars

A

Big stars lose their fuel quickly while small stars lose their size over time slowly

29
Q

How long do bigger stars last for

A

for a few thousand years

.Science Yr9 (6 decks)

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