Tim
boosted
Scientific American: The mathematical mystery inside the legendary ’90s shooter Quake 3
Scientific American: The mathematical mystery inside the legendary ’90s shooter Quake 3
oheso
and 1 other
boosted
Have you ever seen electrons? Watch this!
I got an old Narva BR-2 cathode ray tube (Braun'sche Röhre) that was made for educational purposes. It has some Neon gas inside that makes the electron beam visible.
The second tube in this video is a voltage regulator OD3A that also "glows" nicely.
#electron #CRT #cathoderaytube #electronics #physics #science
Have you ever seen electrons? Watch this!
YouTube
André Lampe
and 1 other
boosted
Too wound up to go to bed, so I just sent lots of emails to people hoping that they'll spread the word and get lots more people to write comments to the FCC telling them that orbital data centres and sunlight-as-a-service are incredibly stupid, dangerous ideas and should never be launched.
Instructions how to submit here: https://darksky.org/news/two-satellite-proposals-threaten-the-night-sky-the-window-to-act-is-now/
I don't think it'll actually make a big difference. But I do think it's incredibly important that the official record shows how many opposed this.
RE: https://mastodon.social/@sundogplanets/116079450649446984
@EUCommission What does the #EU do against the real threat of #spaceDebris and #space #pollution by US corporations like #SpaceX & Co? The space is not a military room, it is at first nature and our vulnerable atmosphere! We only have this one planet!
https://mastodon.online/@sundogplanets@mastodon.social/116079450784889577
5
Hans-Cees 🌳🌳🤢🦋🐈🐈🍋🍋🐝🐜
boosted
Naar #duurzaamheid toe is haver- en sojamelk altijd stukken beter dan koemelk.
Zoals je ziet in deze grafiek ( #science & #environment), is het op vlak van emmissies havermelk dat wint tgov sojamelk. Naar land- en watergebruik toe ben je iets beter af met sojamelk.
Een dubbeltje op zijn kant, zou ik zeggen...
#havermelk #sojamelk #melk #sustainable
(2/2)
Shi
and 1 other
boosted
If you live in #Munich or nearby, save the date!
On 26 February at 19:00, our Director General Xavier Barcons will give a talk at the Instituto Cervantes in Munich explaining why we build large telescopes to answer big questions about the Universe.
The talk will be in Spanish with simultaneous translation into German. Admission is free, but registration is required.
📷C. Letelier/ESO
#munchen #bayern #germany #deutschland #astronomy #astrophysics #space #science
If you live in #Munich or nearby, save the date!
On 26 February at 19:00, our Director General Xavier Barcons will give a talk at the Instituto Cervantes in Munich explaining why we build large telescopes to answer big questions about the Universe.
The talk will be in Spanish with simultaneous translation into German. Admission is free, but registration is required.
📷C. Letelier/ESO
#munchen #bayern #germany #deutschland #astronomy #astrophysics #space #science
Frosch B
boosted
#theBeeAt3
Basic bee facts every day at 3pm.
# 265
As temperature increases the average size of actively foraging female #bumblebees decreases.
Smaller sized bumblebees seem better able to cope with higher temperatures when foraging than their larger sisters.
#bees
#nature #worldbeesanctuary
#wildlife #environment
#insects #biodiversity
#science #education
🐝🌍
Have you ever seen electrons? Watch this!
I got an old Narva BR-2 cathode ray tube (Braun'sche Röhre) that was made for educational purposes. It has some Neon gas inside that makes the electron beam visible.
The second tube in this video is a voltage regulator OD3A that also "glows" nicely.
#electron #CRT #cathoderaytube #electronics #physics #science
Have you ever seen electrons? Watch this!
YouTube
#theBeeAt3
Basic bee facts every day at 3pm.
# 265
As temperature increases the average size of actively foraging female #bumblebees decreases.
Smaller sized bumblebees seem better able to cope with higher temperatures when foraging than their larger sisters.
#bees
#nature #worldbeesanctuary
#wildlife #environment
#insects #biodiversity
#science #education
🐝🌍
European agree – our security is on the right track and the momentum is building.
The mandate for EU action is definitive:
🔹 74% support for defence investment.
🔹 52% trust the EU to strengthen security.
🔹 53% see Space Policy as a key security tool.
68% of citizens believe their country is under threat. Europe is ready to step up.
4 media
Too wound up to go to bed, so I just sent lots of emails to people hoping that they'll spread the word and get lots more people to write comments to the FCC telling them that orbital data centres and sunlight-as-a-service are incredibly stupid, dangerous ideas and should never be launched.
Instructions how to submit here: https://darksky.org/news/two-satellite-proposals-threaten-the-night-sky-the-window-to-act-is-now/
I don't think it'll actually make a big difference. But I do think it's incredibly important that the official record shows how many opposed this.
RE: https://mastodon.social/@sundogplanets/116079450649446984
@EUCommission What does the #EU do against the real threat of #spaceDebris and #space #pollution by US corporations like #SpaceX & Co? The space is not a military room, it is at first nature and our vulnerable atmosphere! We only have this one planet!
https://mastodon.online/@sundogplanets@mastodon.social/116079450784889577
5
ancho
boosted
Yes, you may be killed by falling human made space junk, but the odds remain small(ish) that will occur. The (almost inevitable) #KesslerSyndrome may also prevent future #space flights if all those #satellites in Low Earth Orbit start colliding, creating countless debris.
However, we *ALL* have to worry about the ‘chemical problem’ being created by SpaceX et al in the upper atmosphere. I have been banging on about this for a while and the attached article summarises the science in an easy to understand way - I have pasted the bit about the ‘chemical problem’ below because we *ALL* need to understand what the billionaires are doing to the planet while we are watching.
—————
Quote:
Debris on the ground attracts immediate attention, but atmospheric scientists are tracking a slower process with potentially larger consequences. When satellites vaporize in the mesosphere, 50 to 80 kilometers above Earth, they release clouds of vaporized metals that condense into aerosol particles. Those particles descend into the stratosphere, where Earth’s protective ozone layer resides.
Aluminum is the element of greatest concern. Upon reentry, aluminum oxidizes into aluminum oxide nanoparticles. A single 250 kilogram satellite generates roughly 30 kilograms of these particles. Unlike chlorofluorocarbons, which directly destroy ozone, aluminum oxide acts as a catalyst. One particle can facilitate chemical reactions that destroy thousands of ozone molecules over decades without being consumed.
Researchers from the University of Southern California’s Department of Astronautical Engineering documented an eightfold increase in atmospheric aluminum oxides between 2016 and 2022, directly correlating with the proliferation of satellite constellations, a finding reported in detail by CNET. In 2022 alone, reentering satellites released an estimated 41.7 metric tons of aluminum, approximately 30 percent more than the natural input from micrometeoroids.
Projections based on current deployment schedules suggest annual aluminum oxide emissions could reach 360 metric tons, a 646 percent increase over natural background levels, according to research highlighted by Popular Mechanics. Because these particles take 20 to 30 years to descend into the ozone layer, the atmospheric chemistry of today’s satellite fleet will not manifest as measurable ozone loss until the 2040s. By then, the upper atmosphere could already be saturated with catalysts.
NASA high altitude sampling flights over Alaska in 2023 detected the signature of this process. At approximately 60,000 feet, instruments found that 10 percent of stratospheric sulfuric acid particles larger than 120 nanometers contained aluminum and other metals traceable to spacecraft reentries, according to data presented at the American Astronomical Society meeting that year. The atmosphere now bears a permanent chemical marker of human activity in space.
—————
#space #science #TheBillionairesAreKillingUsAll
https://indiandefencereview.com/starlink-satellites-falling-nonstop-to-earth-risk/
fr-g
boosted
On this day in 1990, the Voyager 1 space probe took a photo of our planet from approximately 6 billion kilometers (3.7 billion miles) away.
"Commissioned by NASA and resulting from the advocacy of astronomer and author Carl Sagan, the photograph was interpreted in Sagan's 1994 book, Pale Blue Dot, as representing humanity's minuscule and ephemeral place amidst the cosmos."
https://en.wikipedia.org/wiki/Pale_Blue_Dot
Image via https://www.bbc.com/news/science-environment-51491471
#OnThisDay #OTD #history #space #science #nasa #PaleBlueDot #humanity
Don Clemente
and 2 others
boosted
If you want to see some rousing volcanic activity, just check out the current live feed from Kīlauea. You might want to sit down first.
https://www.youtube.com/watch?v=tk0tfYDxrUA #science #nature #volcano
[V1cam] Kīlauea volcano, Hawaii (west Halemaʻumaʻu crater)
YouTube
![Live view of the eruption in Halemaʻumaʻu, from the northwest rim of the caldera [V1cam]. This camera is a pan-tilt-zoom model and the view may change depending on activity.](https://files.mastodon.social/media_attachments/files/116/077/948/562/783/547/original/5632c5cab70c0460.png)
4
If you want to see some rousing volcanic activity, just check out the current live feed from Kīlauea. You might want to sit down first.
https://www.youtube.com/watch?v=tk0tfYDxrUA #science #nature #volcano
[V1cam] Kīlauea volcano, Hawaii (west Halemaʻumaʻu crater)
YouTube
4