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...dims predictably. The brightness of Cepheids is so reliable it reveals the distance to galaxies in which they occur. ...ary nebulae from dying stars Ring Nebula (M57) and Owl Nebula (M97), and a supernova remnant Crab Nebula (M1). All are in our 100,000 [http://en.wikipedia.org/w

...waves pass through LIGO's detector, they ripple spacetime, and change the distance between mirrors attached to test masses. The movement of the mirrors is det ...ven light, can escape. A black holes might look like this seen from a safe distance.

...it in its ellipse. For most purposes this means that the AU is the average distance from the Earth to the Sun. It is precisely It's easy to see from this figure that the size of the angles tells us the distance B since we know that A, one astronomical unit, is 150,000,000 km. Let's cal

...releases/2006/10/image/a Cepheid variable stars] and determining that its distance is 6.6 million [http://en.wikipedia.org/wiki/Parsec parsecs] (Mpc). ...their actual luminosity is know, their apparent luminosity tells us their distance.

...er stars in the picture are farther away. They look faint because of their distance, but they are hotter and brighter than Proxima. We can tell a lot about a s ...rmined by the structure of its atomic electrons. Photons, originating long before in the fusion processes of the Sun's core, pass through the outer layers of

As you know, the distance from Earth to the Sun is one [http://en.wikipedia.org/wiki/Astronomical_uni An astronomical unit (AU) is the distance Sun to Earth