Proxima Centauri

SETI scientists evaluate the maximum distance of detectability for various present-day Earth technosignatures -- radio transmissions, atmospheric technosignatures, optical and infrared signatures, and objects in space or on planetary surfaces -- using only present-day Earth instruments.

How large is the biggest galaxy in the Universe?. It was barely a century ago that we thought the Milky Way encompassed the entirety of the Universe. Now? We're not even a special galaxy..

This astronomer's unit measures distance, not time.

At just six light-years from Earth, Barnard's star is close by and has long been of interest to researchers searching for exoplanets. Now, they've found one.

Nestled between mountains in a secluded corner of West Virginia, a giant awakens: the Green Bank Telescope begins its nightly vigil, scanning the cosmos for secrets.

5 big surprises when comparing the worlds in our Solar System. From size to mass to density and more, each world in our Solar System is unique. When we compare them, the results are truly shocking..

The James Webb Space Telescope's search for the earliest stars and black holes has yielded a very weird, very red, puzzle

Scientists say they can detect the presence of advanced propulsion systems through gravitational waves.

Astronomers will be alerted to gravitational waves faster than ever before as LIGO and other detectors "listen" to a universal symphony.

We spent six hours playing a recent build of Judas, the next game from BioShock creator Ken Levine, followed by a lengthy conversation with the renowned game designer to discuss the long wait since BioShock Infinite, bringing the "narrative LEGOs" concept to life in Judas, what the game is all about, and much more.

I used to love rocket launches when I was younger. During every launch, I imagined what it would feel like to be an astronaut sitting in the spacecraft, listening to that final countdown and then feeling multiple gees push me up through the atmosphere and away from our blue marble.

It's almost unfathomable how far humanity has come in just the past few decades in terms of discovering potentially habitable worlds. As recently as 1990, there were no known, confirmed planets…

A red dwarf star is smallest and coolest type of star known. They're also extremely common, making up around 60 to 70% of the stars in the Milky Way. The post What's a red dwarf? Only the most abundant Milky Way star first appeared on EarthSky.

Article URL: https://www.centauri-dreams.org/2023/09/13/reflections-on-breakthrough-starshot/ Comments URL: https://news.ycombinator.com/item?id=37573649 Points: 1 # Comments: 0

The galaxy ESO 300-16 looms over this image from the NASA/ESA Hubble Space Telescope. This galaxy, which lies 28.7 million light-years from Earth in the constellation Eridanus, is a ghostly assemblage of stars which resembles a sparkling cloud. Other distant galaxies and foreground stars complete this astronomical portrait, which was captured by the Advanced Camera for Surveys.

Have any stars visible to human eyes already died?. All stars, eventually, run out of fuel and die. Given all the stars we can see and the vast distance to them, are any of them already dead?.

The highly irregular galaxy ESO 174-1, which resembles a lonely, hazy cloud against a backdrop of bright stars, dominates this image from the NASA/ESA Hubble Space Telescope. ESO 174-1 lies around 11 million light-years from Earth and consists of a bright cloud of stars and a faint, meandering tendril of dark gas and dust.

Very massive stars - more than 10 times the sun's mass - die in a supernova blast that leaves behind neutron stars or even denser black holes, whose gravitational pull is so strong no matter or light can escape

By the time they could get here, they wouldn't want to

Most of us have heard that the Sun is an ordinary, typical, unremarkable star. But science shows we're actually anything but average.