Unit E – Space Exploration Lesson 4-5: (Sec 3.1 and 3.2) Using Technology to See the Visible and Using Technology to See Beyond the Visible

A. Optical Telescopes light is collected and focused into an image use to form an image… refracting telescopes 2 lenses maximum diameter of about 1 m slide 1 of 5

1 lens and several mirrors reflecting telescopes use to form an image... 1 lens and several mirrors reflecting telescopes larger (6 m) slide 2 of 5

enormous light-gathering ability and resolving power can be used to make with segmented mirrors enormous light-gathering ability and resolving power one large telescope slide 3 of 5

B. Combining Telescopes is a technique where 2 or more telescopes are used together to improve resolution interferometry eg) Keck I and Keck II at Mauna Kea Very Large Telescope (VLT) in Chile slide 4 of 5

C. Hubble Space Telescope limits the of telescopes on light and air pollution resolution Earth the Hubble Space Telescope is a reflecting telescope that orbits at an altitude of 600 km slide 5 of 5

Using Technology to See Beyond the Visible 3.2 Using Technology to See Beyond the Visible

A. Electromagnetic Spectrum give us information based on optical telescopes visible light many objects in space emit radio waves, X-rays, infrared (heat) rays, gamma rays etc is energy that travels at the electromagnetic energy speed of light slide 1 of 7

electromagnetic energy has different wavelengths and frequencies wavelength is the distance from one point on a wave to the same point on the next wave frequency is the number of waves passing a single point per second different forms of electromagnetic energy form the electromagnetic spectrum slide 2 of 7

slide 3 of 7

B. Radio Telescopes used to study radio waves emitted by objects in space radio waves are not affected by weather, pollution or the atmosphere can be used to study the in space distribution of matter slide 4 of 7

must be since radio waves have a very large (300 m diameter) long wavelength slide 5 of 7

C. Radio Interferometry combine to get multiple radio telescopes greater resolution can be arranged in large groups called to increase of measurements arrays accuracy can be used to see planets orbiting distant stars slide 6 of 7

D. Space Probes not all questions can be answered by Earth-based telescopes are unmanned that put satellites and “landers” space probes equipment on or close to other planets slide 7 of 7

Assignment Worksheet 7