Loreen channelFrom Sterling Heights
Which aspects of the solar system have we explained? Although the Sun has Comets, like the surface of some outer planet satellites, appear to be composed primarily of water ice, with significant quantities of trapped or frozen gases like carbon dioxide, plus silicate dust. The best age for the Earth comes not from dating individual rocks but by considering the Earth and meteorites as part of the same evolving system in which the isotopic composition of lead, specifically the ratio of lead to lead changes over time owing to the decay of radioactive uranium and uranium , respectively.
Links: Orion Nebula Learn about some Hubble Space Telescope images that were taken in this region and about proplyds, objects which might be young solar systems that we are catching during formation. Now, let's make the planets. A fist-size sample of the Acasta Gneisses, rocks in northwest Canada that are the oldest known rocks on Earth. For example, Potassium decays to Argon