P6 Space Physics

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9 Terms

1
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What does the Solar System consist of?

  1. One star, the Sun

  2. Eight planets

  3. Minor planets (dwarf planets & asteroids)

  4. Moons

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Name the planets in order from their distance from the Sun

  1. Mercury

  2. Venus

  3. Earth

  4. Mars

  5. Jupiter

  6. Saturn

  7. Uranus

  8. Neptune

<ol><li><p>Mercury</p></li><li><p>Venus </p></li><li><p>Earth</p></li><li><p>Mars </p></li><li><p>Jupiter </p></li><li><p>Saturn</p></li><li><p>Uranus</p></li><li><p>Neptune</p></li></ol><p></p>
3
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What is the closest star to the Earth?

The Sun

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How can astronomical distances be measured?

Using light years

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What is a light year?

Distance travelled in (the vacuum of) space by light in 1 yr

6
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Equation for the time taken for light to travel a distance

Time = distance/speed of light

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Why do planets orbit the Sun?

The Sun contains most of the Solar System's mass, so its gravitational attraction pulls planets into orbit around it

<p><span>The </span>Sun contains<strong> most of the Solar System's mass</strong><span>, so its </span><strong>gravitational attraction</strong><span> pulls planets into orbit around it</span></p>
8
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What is the Sun?

  • Star of medium size

  • Consists mostly of hydrogen & helium

  • Radiates most of its energy in the infrared, visible & ultraviolet regions of the electromagnetic spectrum

9
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Orbital speed equation

  • v = orbital speed (m/s)

  • r = average radius of the orbit (m)

  • T = orbital period (s)

<ul><li><p><strong><em>v</em></strong>&nbsp;= <em>orbital speed</em> (m/s)</p></li><li><p><strong><em>r</em>&nbsp;</strong>=<em> average radius of the orbit</em> (m)</p></li><li><p><strong><em>T</em>&nbsp;</strong>= <em>orbital period </em>(s)</p></li></ul><p></p>

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