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Artist’s impression of a black hole star (not to scale). The cut-out reveals the central black hole with it surrounding accretion disk. What makes this a black hole star is the surrounding envelope of turbulent gas. This configuration can explain what astronomers observe in the object they are calling “The Cliff.” (Credit : MPIA/HdA/T. Müller/A. … Read more
According to every experiment, the constants of nature appear to be constant. And this creates a really sticky, nasty, ugly problem for us: it looks like the constants are fine-tuned. As in, if they had any other value, we’d be dead. Actually, less than dead, which is probably worse. Non-existent. Impossible to be here. Check … Read more
While plate tectonics may not be absolutely necessary for life, they may be necessary for a technological civilization to arise. Habitability may be possible on a static world, but habitability probably won’t persist long enough for a technological civilization like ours to appear. Plate tectonics regulates our planet’s climate, and without it, atmospheric CO2 would … Read more
The Gemini South Telescope captured this image of the interstellar comet 3I/ATLAS as it sped through the inner Solar System. The comet’s coma and tail are growing as it approaches the Sun. Image Credit: By International Gemini Observatory/NOIRLab/NSF/AURA/Shadow the Scientist, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=174444353 Comet 3I/ATLAS’s appearance in the inner Solar System in July 2025 … Read more
Protoplanets are celestial objects in the act of forming into full planets within the gas and dust disks surrounding hot, young stars. These objects, often several times the mass of Jupiter, are still embedded in their birth environments, actively feeding on surrounding material through their own circumplanetary disks. Unlike mature planets, protoplanets offer a rare … Read more
A new comet approaching from sunward could make a fine dusk appearance in October. Hello. A bright new comet is now emerging from the Sun’s glare at dusk. It all started with discussion on the boards this past Friday September 12th, about a comet seen in the Solar Wind Anisotropies (SWAN) images near the Sun. … Read more
Three data releases from the recently retired Gaia spacecraft show that far-flung parts of the Milky Way are connected by families of stars born in clusters. Some continue to travel the galaxy together, while others appear wildly dispersed, sometimes as chains of related stars. One cluster is even trying to escape the Milky Way. The … Read more
One possibility to explain the constants of nature is that there’s more than one universe. That we live in a multiverse, with each different universe “sampling” different values of the constants. There are a few extremely hypothetical ideas in physics that can lead to the multiverse. One is through the concept of eternal inflation, where … Read more
This photo of comet C/2020 F3 NEOWISE was taken in July 2020. There’s no doubt that comets have struck Earth in the past, and some have exploded in the air above the surface. One of these exploding comets could’ve triggered the Younger Dryas, bringing and end to the Clovis culture and wiping out megafauna. Image … Read more
Blue Origin is committed to making a permanent human presence in space a reality. To this end, they have developed the New Shepard and New Glenn rockets to send payloads to orbit, and aim to create super-heavy launch vehicles to reach the Moon (New Armstrong and Blue Origin) and beyond. Another focus has been on … Read more