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Transcript
Learning outcomes:
You should
• Know the other objects we share our
solar system with
•Understand how and why telescopes are
used in astronomy
1066, the Battle of
Hastings
 Normandy invaded
Britain – and won
 Recorded in the Bayeux
Tapestry
 70 metres long - includes
623 people, 202 horses,
41 ships and 55 dogs


Halley’s Comet?
These men
wonder at the
star






12 BC – the Star of
Bethlehem?
Periodic comet
Visits Earth every 75 -76
years
Visible with naked eye
Last visit 1986
Next visit 2061

Rock, dust, ice and frozen
gases
 Dirty snowballs





Between 500 m and 50
km across
Start to melt the closer
they get – produces tail
Asteroids – left over bits
Solid lump of rock
10 – 100 km across






Dinosaurs all died
Impact on Earth would
produce large amounts of
debris
Blocked out sunlight
Collision every 200-300 years
1908 in Russia – 2000km
What could we do to prevent
this?
Telescopes – first used
by Galileo 400 yrs ago
 Magnification – x20
 Affected by atmosphere

 Scatters light

Hubble telescope
 353 miles
 In orbit, not affected by
atmosphere


Not just light – radio waves, microwaves, UV
Radio telescope
 Objects emit radiation in radio wavelength

Satellites
 Detect EM waves that don’t penetrate
atmosphere
 Stars exploding – gamma rays
 Far off planets – infra red
 Black holes – nothing
A.
Earth
B.
Jupiter
C.
Pluto
D.
Venus

A.
It is closer to the Sun
B.
It is further away from the Sun
C.
Acid Rain
D.
The Greenhouse Effect


A.
Comet
B.
Planet
C.
Asteroid
D.
Moon
A.
Iron and nickel
B.
Strontium
C.
Hydrogen and helium
D.
Helium and neon

A.
Earth
B.
Venus
C.
Saturn
D.
Mars
