- 217 Posts
- 934 Comments
Delta_V@lemmy.worldto
196@lemmy.blahaj.zone•Here is a quick example i made to test out spacial db-s, it is of a commune on north america "east wind"English
1·7 days agoIt was also rotated 90 degrees for some reason? The river is on the south side of the community.
Delta_V@lemmy.worldto
Games@lemmy.world•I still can't get over Skyrim. Are there any games that can replace it?English
3·7 days agoThe writing and atmosphere is better in New Vegas, but the gunplay is better in 4.
Delta_V@lemmy.worldOPto
A Boring Dystopia@lemmy.world•Paramount Hires Former Biden White House Official Shuwanza Goff as Lead Democratic U.S. Government Affairs ExecEnglish
151·9 days agoWalked through the revolving door from professional bribe solicitor to pro-active agent of bipartisan capitalist corruption.
Delta_V@lemmy.worldto
World News@lemmy.world•Israel hit by wave of Iranian missiles. Iranian military says: "This is the beginning of a full week of continuous strikes"English
221·12 days agoThe cease fire was broken on day one when USA blockaded the ports, Iran demanded ships pay tolls for passing through the strait, and Israel and Hezbollah never got the memo to stop shooting at each other.
‘Negotiating’ in those conditions is performative at best.
Delta_V@lemmy.worldOPto
Space@mander.xyz•What Happens to a Star That Captures A Primordial Black Hole?English
5·12 days agoPBH with mass <10^6g would have evaporated before the universe had cooled enough for atoms to form. Its possible they didn’t fully evaporate, but instead became “Plank relics”, which are a dark matter candidate.
PBH with mass 10^7g to 10^16g would have evaporated already, producing a background of gamma rays and gravity waves that we don’t see.
PBH with mass 10^17g to 10^22g would still exist today, and the gravity waves they generate are too small to be detected by current detectors. These are also a dark matter candidate.
PBH with mass >10^23, in sufficient numbers to explain the existence of dark matter, would cause gravity lensing that we don’t observe.
So according to observations, if the early universe produced PBH, they didn’t have an even distribution of masses from giant to tiny. Either they were all tiny (<1 ton), or they were all medium size (asteroid mass).
My favorite explanation of dark matter is the formation of asteroid mass PBHs when the early universe went through the phase change that separated the electroweak force into the electromagnetic force & nuclear weak force. Just a bit before electroweak symmetry breaking, the universe was in a state of supercooled false vacuum, and then bubbles of today’s vacuum energy started expanding. The pockets of false vacuum between the expanding bubbles of true vacuum would be slower to inflate, causing their density to grow relative to the rest of the universe, until they collapse into PBH. Because they’re all formed at the same time, from similar size pockets of similar density plasma, the resulting population of PBH are uniformly asteroid mass rather than having a Gaussian mass distribution.
Further reading:
Gaussian Planck Relics are Ruled-Out as Dark Matter by LIGO
Constraints on primordial black holes from the Galactic gamma-ray background
Delta_V@lemmy.worldOPto
Space@mander.xyz•Astronomers Detect a Close Pair of Supermassive Black Holes for the First TimeEnglish
2·15 days ago18,000 km/s
Delta_V@lemmy.worldOPto
Space@mander.xyz•Astronomers Detect a Close Pair of Supermassive Black Holes for the First TimeEnglish
22·15 days agoH A U L I N G A S S ! ! !
Each is moving at ~6% of the speed of light!
Delta_V@lemmy.worldOPto
Space@mander.xyz•New propulsion system could make tiny satellites both fast and fuel-efficientEnglish
8·16 days agoThe paper linked to in the article says the thrusters have a specific impulse of 600s, and a thrust-to-power ratio of about 50 mN/kW.
Compared to the xenon ion thrusters used on the Dawn spacecraft, these new multi-mode thrusters produce more thrust, but are significantly less efficient. Dawn’s thrusters have a specific impulse of 3,100s and a thrust-to-power ratio of about 36 mN/kW.
Even so, it means satellites can be built with one small fuel tank that can power high efficiency electrospray thrusters to make slow maneuvers, or use the same fuel as a monopropellant to quickly get out of (or into) the way of something. ASCENT monopropellant thrusters can have a specific impulse slightly better (240 Isp) than traditional hydrazine monopropellant thrusters (235 Isp).
Delta_V@lemmy.worldOPto
Space@mander.xyz•Something Just Passed Between Us and a Distant Star.English
4·22 days agoTo be fair, primordial black holes are a candidate for explaining what dark matter is.
…There is a range of masses, , usually described as the ‘asteroid mass window’, where PBHs can make up all of the DM…
source: https://www.sciencedirect.com/science/article/pii/S0550321324000609
Delta_V@lemmy.worldto
Ukraine@sopuli.xyz•P4P missile interceptor drone tested in UkraineEnglish
3·24 days agoIt looks like an interesting concept, but I wonder if a 2 stage system would be more efficient?
The rocket motor would provide more speed if it were not weighed down by the electric propulsion system. If it was built in two detachable parts, you could recover and reuse the launcher.
Delta_V@lemmy.worldto
Lemmy Be Wholesome@lemmy.world•Got to let them learn from their own mistakesEnglish
26·27 days agoWent to school as an elvish impersonator.
Delta_V@lemmy.worldOPto
World News@lemmy.world•Xi Jinping told Trump that Putin may "regret" invasion of UkraineEnglish
11·1 month agoMaybe the “Epstine didn’t kill himself” people will have something to say about that.
Delta_V@lemmy.worldOPto
World News@lemmy.world•Xi Jinping told Trump that Putin may "regret" invasion of UkraineEnglish
21·1 month agoChanging USA’s constitution requires a 2/3’s vote in both House of Representatives and Senate, plus ratification by 3/4’s of the States (i.e. 38 States).
Right now, neither side has the numbers to pass a constitutional amendment.
Republicans control 28 states, Democrats have 18, and 4 are split.
At the Federal level, the House and Senate are both close to an even 50/50 split.
Delta_V@lemmy.worldOPto
World News@lemmy.world•Xi Jinping told Trump that Putin may "regret" invasion of UkraineEnglish
431·1 month agoMoscow’s puppet president is starting to feel the noose tighten. When his term ends, so does his legal immunity and likely his freedom.
Delta_V@lemmy.worldto
Gaming@lemmy.zip•Sony to no longer bring PlayStation narrative single-player games to PCEnglish
1·1 month agoI wonder what the margins and volume are on console sales versus game sales? How many people actually buy a console for exclusive titles, and how many PC game sales would be needed to make the same profit?
Delta_V@lemmy.worldOPto
Space@mander.xyz•A Florida startup just raised $65 million to beam concentrated sunlight at satellitesEnglish
4·1 month agoIt is rather curious.
Delta_V@lemmy.worldOPto
Technology@lemmy.world•Ford Energy plans to deploy at least 20 GWh annually, with first customer deliveries planned for late 2027English
86·1 month agoIts disappointing, but not surprising. US battery tech and charging infrastructure isn’t advanced enough yet to support EV pickups or SUVs. Its just barely adequate for small, aerodynamic sedans that are not towing/hauling anything. An EV pickup needs a deeper battery and a charging station capable of refilling it on a timescale competitive with the ~5 minutes it takes to refill a tank of gas for several hundred miles range.
Delta_V@lemmy.worldto
No Stupid Questions@lemmy.world•Why can't I reply to this specific user's comment?English
9·1 month agocheck the modlog to see if you’re banned from that community?
Delta_V@lemmy.worldto
Programming@programming.dev•Claude Code's creator is sick of the phrase 'vibe coding.' Suggest your alternative here.English
73·1 month agosloppy/paste





















Locking in the gains and taking time to reload and refuel before round 2.