How Scientists Measure The Distance To Stars and Galaxies

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=YLfrDqf94PA

How do we know the Distance to the closest Star to our Sun? Or the Distance to the Andromeda Galaxy? How can Scientists say with confidence that they know the Distance to any Star System, Galaxy or object in the Universe? • We can only detect the light from stars, yet there are many unique and clever ways we can use this to find interstellar distances through space. This video covers these methods by explaining what is known as the Cosmic Distance Ladder. This is an important concept in the fields of Astronomy, Astrophysics and Cosmology. • 0:00 - Light and Measurement in Space • 0:31 - Parallax and Nearby Stars • 2:10 - Cepheid Variable Stars and the Period-Luminosity Relation • 3:40 - Climbing Rungs on the Cosmic Distance Ladder • 4:42 - Standard Candles Explained • 4:54 - Type Ia Supernovae and Peak Brightness • 5:52 - Spiral Galaxies and the Tully-Fisher Relation • 6:42 - Hubble's Law and Cosmological Redshift • 7:17 - Accuracy and Significance of the Cosmic Distance Ladder

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