THE DEEP END: Images of a small patch of sky called the Hubble Ultra Deep Field have revealed several of the most distant galaxies ever seen. The newfound galaxies and their associated redshifts are labeled on the Hubble image. Image: NASA/ESA
Read articles from around the world about the discovery of the earliest galaxies, the deepest archeological dig of the Universe so far. It identified a record redshift of 11.9 for a previously known galaxy and provides the first comprehensive census of baby galaxies when the universe was only 400-400 million years old. Brant Robertson, a PhD alumni of Harvard Astronomy department is a member of the discovery team. He was quoted in the following report.
Gurtina Besla, PhD alumni of Harvard Astronomy Department, is lead author on this article featured in this CFA Press release.
One of the closest galaxies to the Milky Way almost got away with theft. However, new simulations convicted the Large Magellanic Cloud (LMC) of stealing stars from its neighbor, the Small Magellanic Cloud (SMC). And the crucial evidence came from surveys looking for something entirely different - dark objects on the outskirts of the Milky Way.
Alex Parker, a postdoctoral fellow at the Harvard-Smithsonian Center for Astrophysics’ Institute for Theory and Computation, has created several astronomical videos on his own time and posted them on the Internet. His latest video depicts the 2,299 planet candidates Kepler has found since it began searching for planets around stars in 2009.
In this artist's conception, a protoplanetary disk of gas and dust (red) is being shredded by the powerful gravitational tides of our galaxy's central black hole. Credit: David A. Aguilar (CfA)
At first glance, the center of the Milky Way seems like a very inhospitable place to try to form a planet. Stars crowd each other as they whiz through space like cars on a rush-hour freeway. Supernova explosions blast out shock waves and bathe the region in intense radiation. Powerful gravitational forces from a super-massive black hole twist and warp the fabric of space itself.
An international research team, led by Edo Berger of Harvard-Smithsonian Center for Astrophysics, made the most of a dying star’s fury to probe a distant galaxy some 9.5 billion light-years distant. The dying star, which lit the galactic scene, is the most distant stellar explosion of its kind ever studied. According to Berger, “It’s like someone turned on a flashlight in a dark room and suddenly allowed us to see, for a short time, what this far-off galaxy looks like, what it is composed of.”
Cambridge, MA - Scientists at the Harvard-Smithsonian Center for Astrophysics (CfA) and their colleagues at the Heidelberg Institute for Theoretical Studies (HITS) have invented a new computational approach that can accurately follow the birth and evolution of thousands of galaxies over billions of years. For the first time it is now possible to build a universe from scratch that brims with galaxies like we observe around us.
Cambridge, MA - Astronomers have found an extraordinary galaxy cluster, one of the largest objects in the universe, that is breaking several important cosmic records. Observations of the Phoenix cluster with NASA's Chandra X-ray Observatory, the National Science Foundation's South Pole Telescope, and eight other world-class observatories may force astronomers to rethink how these colossal structures and the galaxies that inhabit them evolve.
Eli Visbal is a Physics student who works with Astronomy advisor Avi Loeb. A paper authored by Harvard’s Eli Visbal with colleagues from the California Institute of Technology and Tel Aviv University suggests that it may be far easier than commonly thought to peer deep into the universe’s history and observe the telltale signs of the formation of the first stars and galaxies.
In May, it was announced that the Square Kilometer Array (SKA) — an ambitious network of thousands of radio antennas – would be based in both South Africa (in addition to neighboring countries) and Australia. Assuming funding is in place, construction on phase one is set to begin in 2016, phase two in 2019, with the whole venture to be complete by 2024.
Harvard-Smithsonian astronomers have found a galaxy (within the outlined box) that contains a massive black hole that is being ejected at several million miles per hour. Researchers used a combination of images from telescopes to narrow their ideas about what is happening in this galaxy, supporting the ejected black hole theory. The top image shows a single source of X-rays, indicating that there is a single black hole in this galaxy moving away from the star cluster at the center of the galaxy.
This illustration released by NASA depicts a view of the night sky just before the predicted merger between our Milky Way galaxy, left, and the neighboring Andromeda galaxy. About 3.75 billion years from now, Andromeda’s disk fills the field of view and its gravity begins to create tidal distortions in the Milky Way. The view is inspired by dynamical computer modeling of the future collision between the two galaxies.
The universe is a marvelously complex place, filled with galaxies and larger-scale structures that have evolved over its 13.7-billion-year history. Those began as small perturbations of matter that grew over time, like ripples in a pond, as the universe expanded. By observing the large-scale cosmic wrinkles now, we can learn about the initial conditions of the universe. But is now really the best time to look, or would we get better information billions of years into the future - or the past?
New calculations by Harvard theorist Avi Loeb show that the ideal time to study the cosmos was more than 13 billion years ago, just about 500 million years after the Big Bang. The farther into the future you go from that time, the more information you lose about the early universe.