Vi tager endnu en runde med universelt stof! Hvad sker der i rummet lige for tiden?
1: 3I/Atlas
2: Sten fra Mars
3: Temporary Moon
4: Sattelite made out of wood
5: Starship
6: Store tal
7: Enhederne meter og sekund
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1: 3I/Atlas
NASA deler første fotos af 3I/ATLAS: Ikke rumvæsener
https://videnskab.dk/rummet/nasa-deler-foerste-fotos-af-3i-atlas-ikke-rumvaesener/
NASA press release 19.11.25:
ESA:
https://www.esa.int/ESA_Multimedia/Images/2025/12/Comet_3I_ATLAS_shows_activity_in_Juice_navigation_camera_teaser
ESA - Comet 3I/ATLAS shows activity in Juice navigation camera teaser
During November 2025, ESA’s Jupiter Icy Moons Explorer (Juice) used five of its science instruments to observe 3I/ATLAS. The instruments collected information about how the comet is behaving and what it is made of.
In addition, Juice snapped the comet with its onboard Navigation Camera (NavCam), designed not as a high-resolution science camera, but to help Juice navigate Jupiter’s icy moons following arrival in 2031.
Though the data from the science instruments won’t arrive on Earth until February 2026, our Juice team couldn’t wait that long. They decided to try downloading just a quarter of a single NavCam image to see what was in store for them. The very clearly visible comet, surrounded by signs of activity, surprised them.
Not only do we clearly see the glowing halo of gas surrounding the comet known as its coma, we also see a hint of two tails. The comet’s ‘plasma tail’ – made up of electrically charged gas, stretches out towards the top of the frame. We may also be able to see a fainter ‘dust tail’ – made up of tiny solid particles – stretching to the lower left of the frame.
The image was taken on 2 November 2025, during Juice’s first slot for observing 3I/ATLAS. It was two days before Juice’s closest approach to the comet, which occurred on 4 November at a distance of about 66 million km.
We expect to receive the data from the five scientific instruments switched on during the observations – JANUS, MAJIS, UVS, SWI and PEP – on 18 and 20 February 2026. The delay is because Juice is currently using its main high-gain antenna as a heat shield to protect it from the Sun, leaving its smaller medium-gain antenna to send data back to Earth at a much lower rate.
Though Juice was further from 3I/ATLAS than our Mars orbiters were back in October, it observed 3I/ATLAS just after the comet’s closest approach to the Sun, meaning that it was in a more active state. We expect to see clearer signs of this activity in the data from the science instruments. This includes not only images from JANUS – Juice’s high-resolution optical camera – but also spectrometry data from MAJIS and UVS, composition data from SWI, and particle data from PEP.
ESA - ESA’s ExoMars and Mars Express observe comet 3I/ATLAS
We have an update on 3I/ATLAS!
Until September, figuring out the location and trajectory of 3I/ATLAS relied on Earth-based telescopes. Then between 1 and 7 October, our ExoMars TGO turned its eyes towards the interstellar comet from its orbit around Mars. The comet passed relatively close to Mars, approaching to about 29 million km during its closest phase on 3 October.
The Mars probe observed the comet from a new viewing angle. The triangulation of its data with data from Earth helped to make the comet’s predicted path much more accurate. The result was an impressive ten-fold leap in accuracy, reducing the uncertainty of the object’s location.
Because 3I/ATLAS is passing through our Solar System fast, travelling with speeds up to 250 000 km/h, it will soon vanish into interstellar space, never to return.
The comet is currently being observed with our Juice spacecraft.
Though Juice is farther from 3I/ATLAS than the Mars orbiters were last month, it is seeing the comet just after its closest approach to the Sun, when it is in a more active state. We don’t expect to receive data from Juice’s observations until February 2026.
Komet Kalender:
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2: Sten fra Mars:
https://www.sciencealert.com/curiosity-cracked-open-a-rock-on-mars-and-revealed-a-big-surprise
Curiosity Cracked Open a Rock on Mars And Revealed a Big Surprise : ScienceAlert
https://phys.org/news/2025-12-evidence-driven-climate-mars-jezero.html
Evidence of rain-driven climate on Mars found in bleached rocks scattered in Jezero crater
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3: Temporary Moon
Earth currently has a temporary moon, an asteroid designated 2025 PN7, that is in a quasi-satellite orbit. It is not permanently bound to Earth like the main Moon, but rather shares Earth's orbit around the Sun, occasionally entering our planet's gravitational influence for several decades before drifting away again. Earth has had other temporary "mini-moons" in the past, and this is not expected to be the last.
About 2025 PN7 : Size: The asteroid is between 18 to 36 meters wide, or about the size of a building.
Orbit: It orbits the Sun but has been temporarily captured by Earth's gravity and is expected to remain a quasi-moon until about 2083.
Distance: It does not get as close as the regular Moon, swinging between 4 and 17 million kilometers away from Earth (Moon is 384400 km away, so between 10 and 44 Lunar distances)
2025 PN7 - Wikipediahttps://en.wikipedia.org/wiki/2025_PN7
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4: Satelite made out of wood:
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5: Starship
A: can get us really fast to Uranus:
https://phys.org/news/2025-10-starship-uranus.html
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B: Starship og kapløb med Kina
ældre artikel:
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6: Store tal
For at forstå store tal er det nogen gange meget godt at omregne det til noget andet.
1 * 10^6 sekunder = 11.5 dage
1 * 10^9 sekunder= 31.7 år
1 * 10^12 sekunder = 31 710 år
Så kan vi måske forstå hvor meget forskel der er på en millonær og en millardær. Trillionær burde ikke eksistere.
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7: Enhederne meter og sekund
Generelt kom jeg til at tænke på enheder.
Meter:
Historical definition:
Historically, a meter was defined as one ten-millionth of the distance from the North Pole to the equator along the Prime Meridian.
In 1960 the metre was thus defined in the SI system as equal to 1,650,763.73 wavelengths of the orange-red line in the spectrum of the krypton-86 atom in a vacuum.
It is currently defined as the distance light travels in a vacuum in \(1/299,792,458\) of a second.
Second:
A second is
the base unit of time in the International System of Units (SI), defined as the time it takes for a cesium-133 atom to undergo 9,192,631,770 hyperfine transitions in its ground state when oscillating at a specific microwave frequency.
This precise atomic definition provides a universal standard for time, making it a fixed and consistent unit for the entire world, unlike older definitions based on Earth's rotation which can fluctuate. A second can also refer to an ordinal number meaning "after first"
The old definition of a second was
of a mean solar day. This definition was used until the mid-20th century, when it was replaced because the Earth's rotation is not constant, making the length of a solar day slightly variable. An earlier, less formal definition was based on dividing the hour into 60 parts, each of which was called a "minute," and then dividing that into 60 parts to get a "second," as the ancient Babylonians originally did
(Rabbit hole: The Babylonian number system was a sexagesimal (base-60) system that used only two symbols: a vertical wedge for one (1) and a corner wedge for ten (10). It was a positional system where the value of a symbol depended on its position, with each place representing a power of 60, similar to how our base-10 system uses powers of 10. The system lacked a true zero for a placeholder initially, creating ambiguity, but later added a symbol for this purpose. )
Min pointe: Vores m og s var (er) defineret efter jorden og vores omløb. Enheden m/s er derfor Jordens enhed.
Lysets hastighed i vacuum er en universel konstant, men en Alien vil 100% have en anden enhed end os. Også selvom at vi har fundet bedre naturkonstanter til at definere m og s ud fra.
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