AY 101 Lecture Notes - Lecture 9: Orbit, Comet Nucleus, Sunburn
Document Summary
Our earth is bathed in dangerous radiation from space. All x-rays and gamma ray light is absorbed very high in the atmosphere. Uv light is mostly absorbed by ozone. Some uv still reaches the ground and causes sunburn. Due to water vapor and co2 in the air, the atmosphere blocks mid-ir, and radio and far- Atmosphere is transparent to visible light, near-ir and radio waves. We have seen that different wavelength domains offer info on important types of objects that the optical domain cannot effectively reveal. We need gamma ray, uv, and ir telescopes to study in these domains. Be(cid:272)ause of the earth"s at(cid:373)osphere, ga(cid:373)(cid:373)a ra(cid:455), x-ray, uv, mid-ir, and far-ir observatories must be placed into orbit. Thousands to billions of asteroids and comet nuclei. Everything in the solar system is gravitationally bound to the sun. 99. 85% of the mass of the system. Temp = 5800k at surface, 15,000,000k at center. Composition: hydrogen, helium, 2% all other chemical elements.
