RDE ramjets! As well as being efficient, RDEs can function at higher Mach and lower air compression ratios, which greatly expands the operating regime of ramjets. RDEs could be enablers for practical air breathing hypersonic flight. Overtaking bullets in business class…

#3I/ATLAS ESA/Las Cumbres Observatory/j. Roger

Epic Dragon Scale Calcite 🐉✨ An absolutely glorious two toned, double terminated Dragon Scale Calcite from the Sweetwater Mine, Missouri. We made a custom base for this piece which was difficult because it needed to stand on many crystal points but we love how it turned out.

Gold-in-quartz from the McLaughlin Mine, California, USA 🪙 Photo: gemaofgb Gem-A

Hoping we get another comet like NEOWISE soon 🤓 Definitely the most gorgeous comet I’ve ever photographed. Didn’t even need a telescope to shoot it!

#PPOD: Comet 3I/ATLAS ☄️ Comet 3I/ATLAS is captured in this image by the Gemini North telescope. The incredible sensitivity of Gemini North's Multi-Object Spectrograph (GMOS-N) reveals the comet’s compact coma — a cloud of gas and dust surrounding its icy nucleus. Credit:

We live inside a giant bubble 🫧 Created by the Sun, the “heliosphere” surrounds our entire solar system, but much of it remains unexplored. New findings have mapped a key part of our heliosphere — a result our soon-to-launch IMAP mission will explore in detail. 👇 🧵 1/4

Macross Plus: Movie Edition (1995)

Meteor/fireball lights up Sakurajima volcano and Kagoshima City in Japan tonight ☄️

20 August 1977. Launch of NASA’s Voyager 2 to study the outer Solar System and interstellar space. It left the heliosphere on 5 November 2018, the second artificial object to do so and provided the first direct measurements of the density and temperature of interstellar plasma.

That bright speck isn't a star – it's Earth! And the dot above it is the Moon. #MissionToPsyche captured this image from 180 million miles away while calibrating its cameras. The spacecraft is en route to a metal-rich asteroid between Mars and Jupiter. go.nasa.gov/4oOb03k

ALIENS concept art by Syd Mead.

“Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth.” ― Jules Verne

#FluidDynamics JFM: Turbulence–chemistry interaction in a non-equilibrium hypersonic boundary layer - dx.doi.org/10.1017/jfm.20…

Spectacular prominence eruption from the Sun’s southeastern limb.

The last time we saw Voyager 2 was #OTD in 1977. Voyager 2 celebrates 48 years in space today as it continues its mission of exploration from interstellar space. Highlights from its journey to the outer planets of our solar system and beyond: go.nasa.gov/474iGYD

Jupiter-family comet 47P/Ashbrook-Jackson. 84 days before perihelion. Comet 47P/Ashbrook-Jackson 2025 Aug. 04.78 UT m1=16.1 (m2=17.0) Dia.=0.4' Tail=5.6' in PA 241 deg...[T59] 0.51-m f/6.8 Corrected Dall-Kirkham Astrograph + CCD... T. Prystavski... (iTelescope observatory, Q62

El cometa interestelar 3I/Atlas, observat aquesta passada nit des de l'Observatori de Pujalt. Ubicat a gairebé 400 milions de km, es pot observar ben bé la coma del cometa. L’observació s’emmarca dins el conveni de col·laboració amb l’IEEC, dirigit pel Prof. Josep M. Trigo de l’ICE-CSIC.

Interstellar comet is brightening and has developed a very short dust tail. However, its nuclear magnitude remains unchanged from four days ago (m2=16.2). Comet 3I/ATLAS 2025 Aug. 21.43 UT m1=15.2 (m2=16.2) Dia.=0.3' Tail=0.3' in PA 129 deg ... [T33] 0.3-m f/9 reflector +

From our friends at the Nobel Prize...