News tagged with dark energy

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Dark matter mystery deepens

(PhysOrg.com) -- Like all galaxies, our Milky Way is home to a strange substance called dark matter. Dark matter is invisible, betraying its presence only through its gravitational pull. Without dark matter ...

Oct 17, 2011 4.7 / 5 (22) 30 | with audio podcast

Cosmic coincidence

Cosmologists tend not to get all that excited about the universe being 74% dark energy and 26% conventional energy and matter (albeit most of the matter is dark and mysterious as well). Instead they get excited ...

Sep 05, 2011 4.4 / 5 (17) 20

Are stellar explosions created equal?

Cosmic distances are difficult to grasp and no less difficult to measure. When it comes to other galaxies or even remote parts of our own Milky Way, distance measurements are nothing but assessments, derived from indirect ...

Aug 22, 2011 5 / 5 (1) 7

Team finds Type Ia supernovae parents

Type Ia supernovae are violent stellar explosions whose brightness is used to determine distances in the universe. Observing these objects to billions of light years away has led to the discovery that the universe is expanding ...

Aug 11, 2011 5 / 5 (6) 0 | with audio podcast

Big rips and little rips

One of a number of seemingly implausible features of dark energy is that its density is assumed to be constant over time. So, even though the universe expands over time, dark energy does not become diluted, ...

Jul 04, 2011 4.8 / 5 (9) 37 | with audio podcast