 Solar System: 4.6 billion years old  Earth: 4.5 billion years old  Universe: 13.8 billion years.

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Presentation transcript:

 Solar System: 4.6 billion years old  Earth: 4.5 billion years old  Universe: 13.8 billion years

 The decay of radioactive elements into other elements  Mass gets released as energy

 Uses the rate of decay of certain elements to date rock and other objects

 The time it takes for an element to decay by half

 Dating rocks  Dating meteorites  Dating lunar rocks

 Astronomical Unit (AU)  The distance from the Earth to the Sun  149,600,000 km (92,957,130 miles)

 Parsec: 8 trillion miles  Used to measure the distance to stars  206,265 AU

 Speed of light  186,282 miles/second  670,615,200 mph  Light Year: the distance light can travel in one year  5.9 trillion miles  Proxima Centauri : 4.2 ly

 idp4 idp4