The infant universeAn all-sky picture of the infant universe revealing 13.77 billion-year-old temperature fluctuations (shown as color differences) that correspond to the seeds that grew to become the galaxies. (Credit: NASA/WMAP Science Team)

Astrophysics is a branch of astronomy that explores the physical properties of the cosmos and its composition. Astrophysicists study a broad range of topics, from the tiniest particles of matter and the forces that join them together to the grandest of celestial structures. In essence, astrophysics extends the workings of physics and chemistry that we experience directly here on Earth into the vastness of space. It is both an observational and theoretical science. To probe the universe's past, present and future, astrophysicists have built some of the most complex and precise machines in the world, including terrestrial and space-based telescopes tuned to various wavelengths. The continued seeking of new discoveries is constantly pushing the limits of telescope and model-building technology. 

Eyeing Dark Energy

Feb 29, 2008
South Pole Telescope

Frigid and bone-dry, with six straight months of night each year, the South Pole is a forbidding place to live or work. However, it’s one of the best spots on the planet for surveying the faint cosmic microwave background (CMB) radiation left over from the Big Bang. 

On the GLAST Track

Aug 01, 2007
Gamma Ray Large Area Space Telescope

There’s far more to the universe than meets the eye. Astronomers have long known this, and much of their big-budget work for the past several decades, from radio telescopes to orbiting observatories, has the goal of “seeing” the cosmos on wavelengths that are inaccessible to human sight.

Frontiers in Astrophysics

Jun 25, 2007

How did the universe begin? When—or for that matter will—it end? Answering questions about our very existence is often at the heart of astrophysics.


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