Astronomy: Exploring Time and Space - Week 4

The Tools of Astronomy Telescopes Gallileoscope 1 inch diameter over 400 years ago, modern telescopes now have diameters of 8 or 10 meters. Telescopes can also be used in invisible light wavelengths, e.g. ultraviolet, infrared, radio. James Webb Space Telescope will bring space astronomy to the level of large ground telescopes, 6.5 meter mirror. Ground based telescopes cost about a billion dollars. Hubble Space Telescope cost about $6-8 billion.
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Gravitational Waves Detected

An exciting announcement last week marked another milestone in our understanding of the universe. Almost 100 years ago Albert Einstein predicted the existence of gravitational waves, or ripples in the fabric of space-time. The existence of gravitational waves had been confirmed for the first time in the late 1970s, but they were not able to detect them and prove their existence here on Earth. Not until last week: scientists were finally able to directly observe ripples of gravitational waves.
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