Astronomers have to be extra clever to map out the invisible dark matter in the universe. Recently, a team of researchers have improved an existing technique, making it up to ten times better at seeing in the dark.Continue reading “A new way to map out dark matter is 10 times more precise than the previous-best method”
It now seems clear that dark matter interacts more than just gravitationally. Earlier studies have hinted at this, and a new study supports the idea even further. What’s interesting about this latest work is that it studies dark matter interactions through entropy.Continue reading “Something other than just gravity is contributing to the shape of dark matter halos”
Gravity is a strange thing. In our everyday lives, we think of it as a force. It pulls us to the Earth and holds planets in orbits around their stars. But gravity isn’t a force. It is a warping of space and time that bends the trajectory of objects. Throw a ball in deep space, and it moves in a straight line following Newton’s First Law of Motion. Throw the same ball near the Earth’s surface, and it follows a parabolic trajectory caused by Earth’s warping of spacetime around it.Continue reading “Gravitational-Wave Lensing is Possible, but it’s Going to be Incredibly Difficult to Detect”
Dark matter is difficult for astronomers to study, but that doesn’t keep them from trying. And with skill and determination, they continue to find exciting things about the invisible stuff.Continue reading “Small Amounts of Dark Matter are Creating Much Stronger Gravitational Distortions than Anyone Expected to See”
The most widely accepted cosmological view states that the first galaxies formed about 380–400 million years after the Big Bang. These were made up of young, hot stars that lived fast and died young, causing the galaxies themselves to be turbulent. At least, that was the theory until a European team of astronomers observed a galaxy 12 billion light-years away that closely resembled the Milky Way.
Using the Atacama Large Millimeter-submillimeter Array (ALMA), the team observed the galaxy, SPT0418-47, as it appeared when the Universe was just 1.4 billion years old. Much to their surprise, the team noted that the structure and features of this galaxy were highly evolved and stable, something that contradicts previously-held notions about the nature of galaxies in the early Universe.Continue reading “This Distorted Circle is Actually a Galaxy That Looked Very Similar to the Milky Way, Shortly After the Big Bang”
At the Science Gallery of Trinity College Dublin, a beautiful work of art is capturing the imagination of people all over the world. It’s called “Dark Distortions,” a work of interactive art by Dutch artist Thijs Biersteker of Woven Studio. Inspired by the ESA’s forthcoming Euclid mission, a visible to near-infrared space telescope that will launch sometime in 2022 to study the mysterious nature of Dark Matter.Continue reading “Art Installation that Demonstrates How Dark Matter Bends Light with Gravity”
General relativity tells us that everything, even light, is affected by the mass of an object. When a beam of light passes near a large mass, its path is deflected. This shift in the direction of light is known as gravitational lensing, and it was one of the first confirmed effects of Einstein’s theory.Continue reading “Hundreds of New Gravitational Lenses Discovered to Help Study the Distant Universe”
The weight of the universe (technically the mass of the universe) is a difficult thing to measure. To do it you need to count not just stars and galaxies, but dark matter, diffuse clouds of dust and even wisps of neutral hydrogen in intergalactic space. Astronomers have tried to weigh the universe for more than a century, and they are still finding ways to be more accurate.Continue reading “How Do You Weigh The Universe?”
In 2025, NASA’s next-generation telescope, the Wide-Field Infrared Survey Telescope (WFIRST), will take to space and join in the search for extrasolar planets. Between its 2.4-meter (8 ft) telescope, 18 detectors, 300-megapixel camera, and the extraordinary survey speed it will offer, the WFIRST will be able to scan areas of the sky a hundred times greater than the Hubble Space Telescope.
Beyond its high-sensitivity and advanced suite of instruments, WFIRST will also rely on a technique known as Gravitational Microlensing to search for and characterize exoplanets. This is essentially a small-scale version of the gravitational lensing technique, where the gravitational force of a massive object between the observer and the target is used to focus and magnify the light coming from a distant source.Continue reading “WFIRST Will Use Relativity to Find More Exoplanets!”
To put it simply, Dark Matter is not only believed to make up the bulk of the Universe’s mass but also acts as the scaffolding on which galaxies are built. But to find evidence of this mysterious, invisible mass, scientists are forced to rely on indirect methods similar to the ones used to study black holes. Essentially, they measure how the presence of Dark Matter affects stars and galaxies in its vicinity.
To date, astronomers have managed to find evidence of dark matter clumps around medium and large galaxies. Using data from the Hubble Space Telescope and a new observing technique, a team of astronomers from UCLA and NASA JPL found that dark matter can form much smaller clumps than previously thought. These findings were presented this week at the 235th meeting of the American Astronomical Society (AAS).Continue reading “Hubble Finds Teeny Tiny Clumps of Dark Matter”