5/19 & 5/20 - 8th Grade Agenda Learning Objective: Learn about Telescope Collect HW: Reading & Notetaking p.257– 258 Video: When we left Earth Textbook Reading: p.590 - 596 HW: Reading & Notetaking p.260– 261

Daily Reflection Prompt: Draw what an extra terrestrial life might look like on another planet and list 3 characteristics.

What are some examples of electromagnetic waves? Radio Waves TV Signals Microwaves Infrared rays Light Ultraviolet rays X-Ray

What is the definition of electromagnetic waves? An electromagnetic wave consists of vibrating electric and magnetic fields that move through space at the speed of light.

How fast do electromagnetic waves travel? It is the fastest thing in the universe 300,000 km per second 186,000 miles per second It takes 8 minutes for light to travel from the sun to the earth It takes 3 million years for light to travel from the nearest galaxy (andromeda) to the earth

Electromagnetic Wavelength

How do we use Radio Waves? Radio & TV signals Microwave Oven Radar MRI Cell phone

Visible Light makes up only a small part of the electromagnetic spectrum

Galileo’s Telescope He was the first man to observe the moons of Jupiter and craters on the moons with a telescope in 1608

What is a Refracting Telescope? A telescope that uses convex lenses to gather a large amount of light onto a small area

What is a Reflecting Telescope? A telescope that uses mirrors to focus a large amount of light onto a small area

What is the difference between refracting and reflecting telescope?

What is a Radio Telescope A telescope that uses curved, reflecting surfaces to concentrate faint radio waves from outer space onto small antennas

Four views of the Crab Nebula using different telescopes