Wolf-Rayet (WR) stars are not only hot, bright, and massive. They are also in an advanced stage of evolution, losing mass at an incredible rate.
While surveying the neighboring Andromeda galaxy, astronomers discovered a new batch of Wolf-Rayet stars.
Some huge stars in galaxies may develop into Wolf-Rayet stars before going supernova. That’s why, Wolf-Rayet stars are intriguing candidates for studying the universe’s evolution.
In three months, the tool will begin a six year exploration of dark energy and dark matter.
Dark energy and dark matter discovery tool Euclid successfully launched on a SpaceX Falcon 9 rocket from Cape Canaveral in Florida, USA, at 11:11 local time / 16:11 BST / 17:11 CEST on Saturday 1 July 2023. The first stage proceeded to return to Earth to be recaptured and reused at later flights.
Euclid had a long journey. “Between 23 and 28 June, Euclid was mounted atop the Falcon 9 adaptor, encapsulated in the rocket fairing, and transported to the Cape Canaveral Space Launch Complex 40 (SLC-40),” wrote ESA in a statement.
Euclid’s destination is the Sun-Earth Lagrange point L2, an equilibrium point… More.
Europe’s Euclid space telescope is scheduled to blast off Saturday on the first-ever mission aiming to shed light on two of the Universe’s greatest mysteries: dark energy and dark matter.
This thrum of gravitational waves is constantly pulsing through the universe. It opens a window into the earliest moments after the Big Bang.
Albert Einstein proposed in 1916 that the universe was constantly being pushed and stretched by space-time waves undulating throughout the universe. A group of scientists won the Nobel Prize for finding proof of these waves in 2016, using a laser interferometer to detect a high-frequency gravitational wave emanating from the collision of two black holes or neutron stars less than 100 times the mass of the sun.
Geoff Bennett:
Let’s expand our horizons a bit wider and look at important findings that are literally about space-time and the cosmos as we know it.
You might remember that Albert Einstein theorized that as heavy objects move through time and space, they create ripple effects in the fabric of our universe. Now an international team of scientists have detected new evidence of that. Researchers found new signs of gravitational waves, waves that are affected by huge movements, such as the collision of black holes.
Since the discovery of gravitational waves, scientists have been trying to understand the origin of merging black holes, and POSYDON may be the way to do it.
Black holes are some of the most fascinating celestial bodies in the universe. Their gravitational fields are so strong that even light cannot escape them. One of the ways in which they are formed is when a massive star collapses, resulting in a stellar-mass black hole.
In 2015, the Laser Interferometer Gravitational-wave Observatory (LIGO) discovered gravitational waves (ripples through spacetime) from two colliding black holes. This groundbreaking discovery has prompted astrophysicists to study their origin and formation.
For the first time, researchers using pulsar timing arrays have found evidence for the long-sought-after gravitational wave background. Though the exact source of this low-frequency gravitational wave hum is not yet known, further observations may reveal it to be from pairs of supermassive black holes orbiting one another or from entirely new physics at work in our universe.
A New Window onto Gravitational Waves
In 2016, researchers reported the first detection of gravitational waves by the Laser Interferometer Gravitational-Wave Observatory (LIGO), opening a new window onto a universe’s worth of collisions between extreme objects like black holes and neutron stars. Though this discovery marked the beginning of a new observational era, many sources of gravitational waves remained beyond the reach of our current detectors on Earth.
Posted in cosmology
In less time than it takes to snap your fingers, the universe flashed into existence.
Cosmogenesis is the breathtaking story of how this happened. It includes, in its later moments, the creation of the primordial elements and depicts their organization by dark matter and gravity into vast cosmic structures on the largest scales. Meanwhile, on smaller scales, local gravitational collapse created stars and, later, planets.
The prelude to this story began with a major cosmological event: inflation. Between 10-36 and 10-34 seconds after the Big Bang, the physical scale of our universe doubled in size more than 50 times, so that by today, it is trillions of times larger than the 14 billion-light-year extent we can observe.
This photographer drove six hours from his home in order to find the perfect position for this event that would take place for less than a minute!
