AST 101 Lecture Notes - Lecture 6: Ptolemy, Naked Eye, Supernova Remnant
Document Summary
X-ray photons are much higher energy than optical light. Can pass through glass if gathered head on . Instead, can take advantage of the fact they will bounce if they meet the glass at a small angle. Very high resolution x-ray image best angular resolution of every x-ray telescope. Launched in 1999 onboard space shuttle columbia. Work planet is derived from greek word for wanderer . Planets usually move slightly eastward from night to night relative to the stars. But sometimes they go westward (backwards) relative to the stars for a few weeks: apparent retrograde motion. We see retrograde motion when we pass by a planet in its orbit. Greeks were the first people known to make models of nature. They tried to explain patterns in nature without resorting to myth or the supernatural. Their rejection of the heliocentric model was bas on their scientific. Order: earth, moon, mercury, venus, sun, jupiter, saturn.
