The field of cosmology has come a long way toward understanding
the universe as a physical system: we’ve mapped its history
and structure in great detail, we know what it went through since a
few seconds after its birth until today, we understand...
Five years ago, NASA’s Fermi Gamma-ray Space
Telescope saw more gamma rays than expected from the area
around the center of our galaxy. Many scientists suggest that the
extra gamma rays could be from the annihilation of dark matter
In 1913, Victor Hess measured the background level of
atmospheric ionization while ascending with a balloon. By doing so,
he discovered that Earth is continuously bathed in ionizing
radiation. These cosmic rays primarily consist of protons
The theoretical astrophysicist and Princeton University
professor is well known for his work on NASA’s 2001 Microwave
Anisotropy Probe—he conceptualized the mission and deciphered
the radio telescope’s data to measure the age of the
In the public lecture “The Latest News from the
Cosmos,” Matias Zaldarriaga, Professor in the School of
Natural Sciences, explores the most detailed map of the infant
universe to date. Publicly released on March 21, 2013, the map
Following the discovery in July of a Higgs-like boson—an
effort that took more than fifty years of experimental work and
more than 10,000 scientists and engineers working on the Large
Hadron Collider—Juan Maldacena and Nima Arkani-Hamed,
Why is the expansion of the universe speeding up, instead of
being slowed by the gravitational attraction of galaxies and dark
matter? What is the history of the Milky Way galaxy and of the
chemical elements in its stars? Why are the planetary...
For slightly over a year, I have largely put aside my longtime
interests in the foundations of quantum mechanics and in particle
physics, and have been working on dark matter. This interest came
about in two different ways. The first was a paper on...
One of the remarkable discoveries in astrophysics has been the
recognition that the material we see and are familiar with, which
makes up the earth, the sun, the stars, and everyday objects, such
as a table, is only a small fraction of all of the...
In the public lecture “The World’s Largest
Experiment,” Nathan Seiberg, Professor in the School of
Natural Sciences, discusses the Large Hadron Collider (LHC) and the
potential discoveries it may yield—among them, new insights
about the origin of...