University of Mississippi

ASTR 101


feather+hammer

Wednesday, Sept. 18, 2013

Red bullet The Sky: Tonight we will have a full moon night. It is the Harvest Moon (NASA).
Red bullet Reminder: Test 1 is next Friday. Please bring a scantron sheet (letter-size purple form).
Red bullet Homework #1: Answer 5 questions in writing; due Mon 9/23 (see also the homework policy).
Red bullet Solar Observation? Possibly, on Friday.
Red bullet Today's Topics: Top Hat review question, then finish

Gravity

then, the Nature of Light:

• What is light? Waves of different wavelenths.
How do we know? Interference and diffraction.
• The electromagnetic spectrum.
• How fast does it travel? Always at the
same speed c = 300,000 km/sec!
Red bullet Reading: Chapter 5; See also the lecture notes and today's class summary.

Spaceweather; APOD; Heavens-Above; Clear Sky Clock; PhysOrg Astronomy News; The Sky at a Glance


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