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Hitoshi Murayama
08/01/09

Hitoshi Murayama: The Emperor's Tea

When I assumed the position of director of the Institute for the Physics and Mathematics of the Universe (IPMU), my smart-mouthed friends joked that I became the Director of the Universe.

07/01/09

Dark Energy Camera scans ancient skies

Gazing into space, scientists wonder why the universe is expanding ever faster. What mysterious force is at work? By recording the light from hundreds of millions of galaxies from a mountaintop in Chile, they hope to find out what'’s going on.

11/01/08

The dark universe debate

Who will be the first to prove the existence of dark matter and dark energy? A particle physicist and an astrophysicist go head to head.

08/01/08

New tools forge new frontiers

US particle physics is pushing forward on three frontiers. Each has a unique approach to making discoveries, and all three are essential to answering key questions about the laws of nature and the cosmos.

Logbook of October/November 2007
11/01/07

Dark energy

In the fall of 1997, I was leading the calibration and analysis of data gathered by the High-z Supernova Search Team, one of two teams of scientists —the other was the Supernova Cosmology Project—trying to determine the fate of our universe: Will it expand forever, or will it halt and contract, r

Illustration of four people holding four corner of a dark energy blanket
08/01/07

Dark energy

Dark energy, the weirdest and most abundant stuff in the universe, is causing the expansion of the universe to speed up.

Four people pulling on four corners of a space blanket
08/01/07

Dark energy

Dark energy, the weirdest and most abundant stuff in the universe, is causing the expansion of the universe to speed up.

08/01/07

Non-dark energy

With regard to your story on dark energy (May 2007): Please explain the amount of known energy there is in the universe. If there is a small percentage of known matter, what is the percentage of known energy?

05/01/07

The search for dark energy

What is this stuff that fills the vacuum of space, accelerates the expansion of the universe, and accounts for 70 percent of everything? More than two dozen experiments aim to find out.

05/01/07

A tale of dark energy

In the 1990s, astronomical observations revealed that the expansion of the universe is accelerating. Not knowing what causes this acceleration, scientists began to attribute the phenomenon to some unknown source of energy, coined "dark energy" by astrophysicist Michael Turner.

03/01/07

Appreciating successes

Science is a forward-thinking endeavor: It is more concerned with what can be discovered in the future than what has been learned in the past. Once accomplished, successes are usually taken for granted.