Solar System: 4.6 billion years old Earth: 4.5 billion years old Universe: 13.8 billion years.
Embed Size (px)
Transcript of Solar System: 4.6 billion years old Earth: 4.5 billion years old Universe: 13.8 billion years.
Age of the Earth
Solar System: 4.6 billion years oldEarth: 4.5 billion years oldUniverse: 13.8 billion yearsAge of the Earth, Solar System and Universe
Radioactive DecayThe decay of radioactive elements into other elementsMass gets released as energy
Radiometric DatingUses the rate of decay of certain elements to date rock and other objects
Half-LifeThe time it takes for an element to decay by half
Evidence for the age of the EarthDating rocksDating meteoritesDating lunar rocks
Astronomical Unit (AU)The distance from the Earth to the Sun149,600,000 km (92,957,130 miles)
Measuring the Solar System
Parsec: 8 trillion milesUsed to measure the distance to stars206,265 AU
Measuring the Universe
Speed of light186,282 miles/second670,615,200 mphLight Year: the distance light can travel in one year5.9 trillion milesProxima Centauri : 4.2 ly
Speed of Light
History of the Universe in 10 minuteshttps://www.youtube.com/watch?v=wXLfbfsidp4