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#Astrodon

53 Beiträge42 Beteiligte3 Beiträge heute
Öffentlich
ESO

Let's take a peek inside one of the ALMA antennas! 📡⁠
⁠
The 66 antennas of ALMA are all used to observe the cool Universe. But how does a radio-telescope really ‘see’? 🤔⁠
⁠
First, light is collected by the large dish of an antenna, which is focussed onto the secondary reflector that we can see in the foreground. From there, it goes through one of the several circular windows seen at the centre of this image. Each window leads to a receiver, a device that registers the light collected by the antenna. ⁠
⁠
And did you know? The receivers need to be sealed inside a cryostat that cools them down to –269 ºC, just 4 degrees above absolute zero 🥶⁠

Find out more: eso.org/public/images/potw2517

📷 S. Otarola/ESO

The image is a close up of one the ALMA antennas. In the centre left foreground of the image, is a circular structure held by four support beams that continue outside of the boundaries of the image. In the background is the grey dish made up screwed on panels. To the bottom right in the background is a hole for the receiver cabin, filled with circular and rectangular instruments on a blue plate.
#astrodon#astronomy#astrophysics
Öffentlich
Karl Urban

China wants to launch its lunar probe Chang'e 8 in 2028/29. Remarkable for such a developed national lunar research programme: Its large number of international collaborations, mostly with countries from the global south:

Source: spacenews.com/china-selects-in

China's first lunar mission Chang'e 1 launched in 2007, with many missions and without any setbacks since then.

Lunar surface multi-functional operation robot and mobile charging station (Hong Kong University of Science and Technology and the Hong Kong Polytechnic University). Pakistan lunar rover (Space and Upper Atmosphere Research Commission of Pakistan (SUPARCO) and the International Society for Terrain-Vehicle Systems). Intelligent exploration robot for challenging environments (two micro-rovers) (Middle East Technical University of Turkey, in partnership with Zhejiang University and commercial company Star.Vision). Radio astronomy array (South African Radio Astronomy Observatory and the National Commission for Aerospace Research and Development of Peru). Laser corner reflector array (National Institute for Nuclear Physics–Frascati National Laboratories, Italy). Lunar plasma-dust environment sensor and the lunar ion and high-energy neutral particle analyzer (Russian Federal Space Agency and the Russian State Space Corporation). Lunar neutron analyzer (Ministry of Higher Education, Science, Research and Innovation of Thailand and the National Astronomical Research Institute of Thailand). Visible and infrared imaging system for the lunar surface (Bahrain National Space Science Agency and the Egyptian Space Agency). Lunar potential monitor (Iranian Space Agency).
#space#astrodon#weltraum
Öffentlich *
franco_vazza

Before Easter, I was honoured to give a colloquium to the Lviv Fellow Society (#Ukraine). I've never been there in person, but thanks to my ongoing tight collaborations in 🇺🇦 , I feel bound there and I hope I can visit soon.
To make it more attractive to the general public, I spoke of my recent extravaganza about the "Simulation Hypothesis" frontiersin.org/journals/physi

and it was fun as it sparked many new questions.

Here is the full recording: youtube.com/watch?v=uyM_Pe9pV7Q

#science#astronomy#astrodon
Öffentlich *
Dr. Victoria Grinberg

Ein sehr schöner Artikel von @sianderl:

▶️ zeit.de/2025/17/hubble-telesko

Es ist schon Irrsinn, wenn ich darüber nachdenke, wie anders die Welt war, als Hubble gestartet wurde und wo wir heute sind (gleiches gilt auch für die beiden großen Röntgenteleskope XMM-Newton und Chandra).

Einen Artikel zum 35sten Jubiläum von Hubble mit neuen spektakulären Weltraumbilder gibt es hier:

▶️ esa.int/Science_Exploration/Sp

ZEIT ONLINEHubble-Teleskop : Bleibt da noch Platz zum Staunen?Mit spektakulären Bildern veränderte das Hubble-Teleskop unseren Blick aufs All. Doch zwischen Satelliten und Tourismus ist der Weltraum umkämpft wie nie.
#astrodon
Öffentlich
MPI for Gravitational Physics

On this day, six years ago, @LIGO Livingston and Virgo detected an unusual gravitational-wave signal.

GW190425 was only the second signal from (most likely) a neutron star merger. Its distance to Earth was significantly larger and the sky position less precisely determined than for the first such signal (GW170817). Therefore, astronomers did not observe any afterglow in the electromagnetic spectrum.

The total mass of the merging objects was unusually high compared to known double neutron stars.

ℹ️ aei.mpg.de/142401/news-from-th

The publication abuout the observed gravitational-wave signal appeared on 6 January 2020:

📄 iopscience.iop.org/article/10.

Numerical simulation showing the gravitational waves emitted from orbiting neutron stars.
#OnThisDay#OTD#GW190425
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