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The Solar System
Birth of the Solar System
• Scientists think that our Sun and the planets orbiting it, could be the result of an ancient supernova
The Solar System (p60)
• Sun & planets formed from a swirling cloud of ______ & _____
• Planets held in orbit by Sun’s __________• Planets ________ light from the Sun• Planetary orbits are _____________ (oval)
The Solar System
The Solar System
• You need to be able to remember the order of the planets in the Solar System.
The Solar SystemMnemonic
MyVeryExcellentMotherJustSentUsNinePizzas
MercuryVenusEarthMarsJupiterSaturnUranusNeptunePluto
The Solar SystemMnemonic - Your turn!
MVEMJSUNP
MercuryVenusEarthMarsJupiterSaturnUranusNeptunePluto
The Solar System
Poor Pluto!• Only discovered in
1930• Smaller than
Earth’s moon• Too small to be a
real planet!• Now a ‘Plutoid’
The New Solar System
Centripetal Force
• The planets follow near-circular paths around the ____
• They are kept in orbit by the Sun’s ________
• This force towards the _______ of the circle is known as a centripetal force
Centripetal Force
• Without this _________ force pulling them towards the centre of their orbits, the planets would ____ _____ into space!
Light-Years
• A light-year is the distance that light travels in one year
Speed of light = 3 x 108 m/s
1 year = 31471200 seconds
1 light-year = ? metres
Manned Space Travel (p61)
• Read page 61• Discuss with your
neighbour & note down the problems with manned space travel
Manned Space Travel - Problems
Robotic Space Exploration
• Read page 61• Discuss with your
neighbour & note down the advantages of using robotic probes to explore space
Robotic Exploration - Advantages
Solar System - PREP
Using your notes, textbooks and the internet: www.bbc.co.uk/science/space/solarsystem/www.nasa.gov
Complete sections 1-3 on sheet P2f.1