1. Space Research SNC1D

2. Telescopes Astronomers find out about celestial objects by observing the light coming from them. Instruments used to collect and focus the light are called telescopes. Observatories on an extinct volcano in Hawaii.

3. Telescopes The first telescopes were refracting telescopes that used lenses to focus the light.

4. Telescopes All large modern telescopes are reflecting telescopes that use curved mirrors to focus the light.

5. Telescopes Telescopes can observe light outside the visible spectrum. Radio telescopes of the VLA (Very Large Array)

6. Space Telescopes Since the atmosphere blocks some wavelengths of light and also distorts visible light travelling through it, it is best to place telescopes in space. The HST (Hubble Space Telescope)

7. Getting into Space However, it costs a lot of money and fuel to put an object into space against the pull of Earth’s gravity. Polar satellite launch vehicle

8. Getting into Space It is also difficult to repair objects in space. HST maintenance

9. Unmanned Probes It is more cost-effective to send unmanned probes up because they do not require life support (oxygen, water, food) and do not suffer health problems from the microgravity.

10. Unmanned Probes All of the exploration of objects beyond the Moon has been done by unmanned probes (e.g., the Mars rovers).

11. Fringe Benefits Investments in the space program have not only allowed us to explore strange new worlds but also develop technologies that may be used on Earth, from blood pressure monitors to water purifiers to the detector in your digital camera.