Unit 2 Flashcards

0
Q

Astrology

A

Belief that the star arrangement affects our everyday life.

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1
Q

Astronomy

A

The study of space

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2
Q

Constellations

A

Groups of stars developed by ancient Greeks

They don’t exist because stars are at different distances

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3
Q

Early practical uses of stars

A
  • timelines were used depending on where the stars were in the sky
  • caleneder depending on which stars appeared in the night sky
  • directions like North Star
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4
Q

Geocentric theory

A

The earth was the centre of universe and everything revolves around us.

The stars were one single plane (same distance away)

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5
Q

Copernicus

A

Heliocentric theory.

Believed earth was not the centre but the sun was.

He had no proof to support his hypothesis.

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6
Q

Three key scientists who showed proof for heliocentric theory.

A

Kepler, Galileo, and Newton.

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7
Q

Kepler

A

Proved that objects in space must be at different distances.

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8
Q

Galileo

A

Improved the telescope and used it to first look at stars and planets

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9
Q

Newton

A

Proved that the sun has enough mass to hold objects in orbit.

Sun is the centre

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10
Q

Rotation

A

Turning of the earth on its own axis

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11
Q

Sidereal day

A

Rotation relative to stars in space is faster than 24 hours. ( 23 hrs 56 min)

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12
Q

Revolution

A

Movement of earth around the sun

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13
Q

Circumpolar constellations

A
  • Constellations found more north and south

- appear to make circles in the night sky

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14
Q

Rising and setting constellations

A

Te constellations found along the suns path = zodiac constellations

-closer to equator

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15
Q

What do stars emit?

A

particle radiation and non particle radiation

16
Q

Light travels at

A

300 000 km/s

17
Q

Heliocentric theory

A

Earth was not centre but sun was

18
Q

How many constellations

19
Q

Revolution takes

A

365 1/4 days

20
Q

How long does rotation take

A

Rotation takes 24 hours but a sidereal day takes 23 hrs 56 min

21
Q

What causes seasons

A

When northern hemisphere is tilted towards the sun it is summer

When northern hemisphere is tilted away from sun it is winter

22
Q

Spectroscope

A

Used to observe the properties of visible light.

Divides light into its component colours

23
Q

Hubble telescope

A
  • Launched in 1990
  • Reflecting telescope
  • Moves around earth approximately 100 minutes.
  • No atmosphere so a clear image
  • it costed a lot of money
24
Optical telescopes
Increase the size of the object we are looking at Make objects appear brighter Observe visible light
25
Disadvantages and advantages for refracting telescopes
They are not limited in size. The bigger the mirror the clearer the image Can built very large so is expensive