1. Section 1.2 Telescopes allow us to study space from earth

2. Light and other forms of radiation carry information about space
Electromagnetic radiation: energy that travels across distances as certain types of waves
Astronomers learn about size, distance, and movement of an object by studying its radiation

3. Telescopes Telescope: a device that gathers electromagnetic radiation
Astronomers use telescopes to collect information about space

4. Reflecting Telescopes
Curved mirror that gathers light
Built to gather infrared or ultraviolet
radiation
Eyepiece: a second mirror that reflects the image to recording equipment

5. Refracting Telescopes
Has an objective lens or a curved piece of glass at one end of a long tube
This lens gathers light and focuses it to form an image near the other end of the tube
Eyepiece will magnify the images

6. Radio Telescopes
Show where radio waves are being emitted by objects in space
Has a curved metal surface called dish that gathers radio waves and focuses them onto an antenna