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Using Technology to See beyond the Visible

Dive into the electromagnetic spectrum to uncover the unseen cosmos with radio telescopes and space probes. Learn how technology unveils stars, galaxies, nebulae, and more through radio waves, infrared signals, and UV frequencies.

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Using Technology to See beyond the Visible

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  1. Using Technology to See beyond the Visible

  2. There are many types of radiation coming from stars: • Radio waves • Infrared waves (heat) • UV waves • X rays • Gamma Rays Light is only a SMALL portion of the entire spectrum. The Electromagnetic Spectrum

  3. The Electromagnetic Spectrum

  4. The Electromagnetic spectrum

  5. The Electromagnetic spectrum

  6. Radio Telescopes

  7. These use radio waves which are long, weak and quite harmless – yet travel large distances! Astronomers use these waves to map stars, galaxies, and nebulae from ours and other solar systems Computers and electronics are used to map these signals one they are recorded Radio Telescopes

  8. Many radio telescopes use a bowl-shaped reflector called a dish to collect radio waves from space. The reflector focuses the waves onto an antenna that changes them into electric signals. A radio receiver amplifies these signals and records their strength at different frequencies and from different directions. The information is analyzed by a computer to draw a picture of the source of the radio waves or to analyze the chemicals found in the source.

  9. Radio telescopes can work in any type of weather, they are not affected by pollution, clouds or the atmosphere • By focusing radio telescopes on areas that appear empty, astronomers have found information previously unknown • Neutral hydrogen – emits no light, but does emit energy; they mapped its distribution and found out we are in a spiral galaxy • Usually made from metal mesh, curved inwards and have a receiver in the middle • These waves are transformed to a electrical signal that gets read by a computer for interpretation

  10. Radio Interferometry • Just like with reflecting telescopes- radio telescopes can be combined for a greater resolving power • An array (more than 1 telescope together) works to help bring accuracy and clarity to visions of the land beyond

  11. Space Probes • Are unmanned satellites or remote controlled ”landers” that use equipment to explore places that are too dangerous for humans at this time! • These probes/landers take pictures of places as well as possibly samples of the surface of planets

  12. SPACE PROBES – Use pg. 444

  13. Opportunity and Spirit Saturn Collision of Probe with Comet! SPACE EXPLORAtion

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