Toggle light / dark theme

Astronomers identify 19 new Wolf-Rayet stars in Andromeda Galaxy

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.

Euclid successfully launched into space by Falcon 9 rocket

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.


ESA/YouTube.

Scientists find evidence of gravitational waves warping space-time throughout the cosmos

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.

Gravitational wave discovery leads to greater understanding of the fabric of our universe

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.

Unravelling colliding black holes just got a boost, thanks to simulation tools

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.

First Compelling Evidence for the Gravitational Wave Background

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.

The Planck era

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.

/* */