Moon

• 340,400 kilometers from the earth
• 3476 kilometers in diameter
• Atmosphere-none
• One day lasts 29.5 earth days
• It can be as hot as 100 degrees celcius and as cold as -170 degrees celcius
• Its roughly as wide as Australia

Constellations

• In all, 88 constellations have now been named. About half of them can be seen on a clear night. Some such as the Great Bear are very large. Others such as the Southern Cross or the Crux are very small.

• Many constellations, including the Zodiac ones, were named long, long ago after animals and ancient gods and heroes.

•  Although from earth they seem to be in a group, individual stars in a constellation may be huge distances apart. Some are much father from earth than others.

Stars

• The oldest stars are 15 billion years old
• The largest stars are red supergiantswhich can be 1000 times bigger than our sun
• The hottest stars are called blue supergiants
• The temperature on there outside is five times hotter than our sun
• The smallest stars are neutron stars, at around 15 km across

Pluto

• 5.9 billion kilometers from sun
• 2200 kilometers in diameter
• 1 moon
• Atmosphere-not known
• One day lasts 6.4 earth days

Neptune

• 4.5 billion kilometers from the sun
• 50,000 kilometers in diameter
• 8 moons
• Atmosphere-methane and other gases
• One day lasts about 18 earth hours

Uranus

• 2.9 billion kilometers from the sun
• 51,000 kilometers in diameter
• 15 moons
• Atmosphere-hydrogen, helium and methane gases
• One day lasts about 17 earth hours

Saturn

• 1.4 billion kilometers from the sun
• 120,00 kilometers in diameter
• 18 moons
• Atmosphere-hydrogen and helium gases
• One day lasts about 10.8 earth hours

Juipter

• 788 million kilometers from the sun
• 142,800 kilometers in diameter
• 16 moons
• Atmosphere-hydrogen and helium gases
• One day lasts 10 earth hours

Mars

• 228 million kilometers from the sun
• 6790 kilometers in diameter
• 2 moons
• Atmosphere-carbon dioxide gas
• One day lasts about 24.5 earth hours

Earth

• 149 million kilometers from the sun
• 12,713 kilometers in diameter
• 1 moon
• Atmosphere- mainly nitrogyen but a bit of oxygen
• 23 hours and 56 minutes for one full day

Venus

• 108 million kilometers away from the sun
• 12,140 kilometers in diameter
• No moons
• Atmosphere- mainly carbon dioxide
• One day lasts 117.4 earth days

Mercury

 



• 58 million kilometers away from the sun
• 4880 kilometers in diameter
• No moons
• No atmosphere
• One day on mercury last 176 earth days



Supernova

• Only happens when big stars die
• Explosion reaches up to 9,000-25,000 miles
• One of the most energetic explosive events
• So bright that it is 100 million times brighter than the sun
• Nova means new in latin

Milky Way

• A swirl of stars
• Latin for milky road
• Got its name from its appearance
• Contains our solar system
• Contains up to 200-600 billion stars
• A barred spiral galaxy 100,000-120,000 light years in diameter

Black Holes

• Form when large stars die
• Space monsters
• Swallows everything that comes close
• Not even light can escape it when it comes to a certian point
• Bottom is called singularity
• Not all stars form black holes
• It is a region of space time
• The event horizon marks the point of no return

The Sun

• About 150 million km away from the earth
• About 4.6 billion years old
• An average star some stars are brighter and some are dimmer
• Diameter is nearly 1.4 million km - 109 times the earths which means 1 million earths could fit in the sun

Solar Eclipse

• The latest partail eclipse was on last friday 25/11/11
• The next full eclipse will be on November the 13 2012
• Happens when the moon is between the earth and sun
• Either fully or partially blocks the sun
• Only during a new moon