News tagged with doppler effect

Why is the night sky black?

It sounds obvious. That's what night is. The sun has set and when you look up at the sky, it's black. Except where there's a star, of course. The stars are bright and shiny.

dateDec 02, 2015 in Astronomy
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The kinematics of merging galaxies

The unprecedented sensitivity of space telescopes has powered a revolution over the past decade in our understanding of galaxies in the young universe during its first billion years of existence. These primitive objects are ...

dateMay 28, 2015 in Astronomy
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Measuring the proper motion of a galaxy

The motion of a star relative to us can be determined by measuring two quantities, radial motion and proper motion. Radial motion is the motion of a star along our line of sight. That is, motion directly toward us or away ...

dateSep 23, 2014 in Astronomy
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