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Year 9 Mid Years Revision > Science Space > Flashcards

Science Space Flashcards

1
Q

Diffrent belefis (china)

A

People in china and india belived that the earth is flat and held up by 12 pillars

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2
Q

Diffrent beilefs(thailand)

A

People in Thailand believed that a
solar eclipse occurred when a god
called Rahu swallowed the Sun.

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3
Q

The wood turtle(india)

A

In India people believed that the
Earth was supported on the back of
a giant wooden turtle.

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4
Q

Describe the similarities and differences between the geocentric and the heliocentric
models.

A

The geocentric model says that the earth is at the center of the cosmos or universe, and the planets, the sun and the moon, and the stars circles around it. The early heliocentric models consider the sun as the center, and the planets revolve around the sun.

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5
Q

Big bang

A

The big bang is how astronomers explain the way the universe began. It is the idea that the universe began as just a single point (13.7billion years ago) then expanded and stretched to grow as large as it is right now—and it is still stretching!

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6
Q

The conditions to send a satellite into orbit

A

Satellites are able to orbit around the planet because they are locked into speeds that are fast enough to defeat the downward pull of gravity

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7
Q

Orbits(polar)

A

This satellite go over the north and south pole in a polar orbit satellites are useful for mapping

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8
Q

Orbit (LEO)

A

There are lots of satellites, such as the international space station in Low Earth Orbit. This is an orbit below 1000km from Earth some Leo satellites go over the North Pole and south pole.

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9
Q

Benefits of the space programme

A

Health and medicene transportation,public safety,information technology

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10
Q

Risks of space programme

A

Spcae radiation,isolation distance from Earth,lack of gravity

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11
Q

Do aliens exist?

A

As there billions of stars and galaxies theres a chance of aliens existing

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12
Q

Exo planets

A

A planet orbiting a star that is not our sun

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13
Q

When do scientists use mathematical models

A

Scientists use mathematical models.these are very useful when you cannot do experiments to collect data

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14
Q

What is a mathematical model

A

As set of rules using maths or usually using a comuter that helps you predict what could happen

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15
Q

What does frank drake want to calculate

A

Working out how many planets are likely to have life on them. The search for alien life continues

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16
Q

SETI

A

Search for extra-terrestrial intellgence

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17
Q

Who came up with the heliocentric model of the universe

A

Galileo galliei

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18
Q

What are the required conditions for habitable Zone

A

Atmosphere, with oxygen water and a sutiable climate

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19
Q

How to find out mean

A

To find the mean, add all the numbers together then divide by the number of numbers.

20
Q

How many planets are in the solar system

A

8

21
Q

Why is the moon classified as a natural satellite

A

It orbits planet

22
Q

Describe the orbit of a artifical satellite

A

Circullar orbit

23
Q

Mars appers to move backwards across the sky name this type of motion

A

Retrogade motion

24
Q

Scientists now believe that theory 2 is correct suggest why they might think theory 1 is wrong

A

New evidence

25
Q

Sequence of a star much bigger than the sun

A

Protostar>main sequence star>red super giant>supernova>neutral/black hole

26
Q

Sequence of a star the same size as the sun

A

Protostar>main sequence star>redgiant>whitedwarf> black dwarf

27
Q

Explain how atoms of the elements helium are formed in a star

A

When a star becomes a red giant it fuses heluiem

28
Q

Explain how atmos of very heavy elements, such as gold were formed

A

Heavy elements formed when a massive star collapes than explodes as a supernova fussion

29
Q

Describe what happens to a star much bigger than the Sun, once the star reaches the
end of the ‘main sequence’ period of its life cycle. Your answer should include the
names of the stages the star passes through.

A

When a star reaches the end of the main sequence star runs out of hydrogen the star expands the star cools it forms a red super giant. supernova forms heaver elements core shrinks becoming a neutron star if mass large enough core collapses and black hole forms

30
Q

How does a Refracting Telescope work?

A

Objective lens,focal length,eye piece

31
Q

What is the major problem of the refracting
telescope?

A

Causes blurry image.

32
Q

How does a Reflecting Telescope work?

A

Eye piece lens,concave mirror, flat mirror

33
Q

Describe one similarity and one difference between reflecting and refracting
telescopes

A

The main difference between a refracting telescope and a reflecting telescope is how they magnify light from distant objects.
Similarity is both telescopes will make a small and inverted image of whatever it’s pointed at

34
Q

I can suggest an observation that could not
be explain by the geocentric model.

A

The phases of Venus

35
Q

I can explain why atoms could not be
formed immediately after the Big Bang

A

the universe was both too hot and too dense for elements to form.

36
Q

I can explain ways in which the Big Bang
theory is supported by evidence.

A

the discovery in the 1960s of cosmic microwave background radiation

37
Q

I can explain different techniques
astronomers use to search for possible
habitable planets.

A

The transit method is the most prolific, but there’s also the radial velocity method, direct imaging.

38
Q

Describe how astronomers use
telescopes

A

using curved mirrors to gather and focus light from the night sky.

39
Q

Describe two types of telescope

A

Refractor Telescopes utilize specially designed lenses to focus incoming light into an image for you to see with your eye or capture with a telescope camera.

Reflectors use mirrors, which causes light to reflect at various angles within the optical tube, extending the overall light path.

40
Q

Describe how a Convex lens works

A

Convex lenses refract light inward toward a focal point.

41
Q

Describe how astronomers search
for life on other planets. Include
SETI and Carl Sagan!

A

using radio telescopes to search for signals from other civilizations.

42
Q

What is accuracy

A

Accuracy:The accuracy of a measurement is how close a result comes to the true value.

43
Q

Precisied

A

Is close to the answer but not as right as the answer

44
Q

Repatable result

A

Same person reapts the expirement and gets the same answer everytime

45
Q

Reproducible

A

Anyone can get the same results

46
Q

Resolution

A

Smallest reading on a thermometer

47
Q

Anomly

A

Anomalous result: anomalous results dont fit the pattern and should be ignored and not included in the mean

Year 9 Mid Years Revision (5 decks)

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