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Landingen er ekstremt avanceret... så der skal ikke gå meget galt før de 14 milliarder ryger direkte ned i sandet på Mars..
Zombie Steve Jobs (3) skrev:Det kan vi så gange med nogle og 30?
Måske, men den kan ikke køre på solenergi ligesom de tidligere mars-rovere. Dens rækkevidde er faktisk kun 4,5 km: http://ing.dk/artikel/119986-nasas-nye-marsbil-ful...
Der står også mange andre sjove ting om den bil. Bla. at softwaren ikke er færdig inden opsendelsen, så det regner man med at opdatere efterfølgende.
Men der har også været plads til lidt humor:
http://www.arrl.org/news/new-mars-rover-to-feature...
Spøjst at de bruger plutonium i generatoren? Sad faktisk og læste om emnet for et par dage siden (kan forøvrigt anbefale det!) - svjv så er der andre radioaktive stoffer der er mere effektive - dog skriver de ikke hvilket isotop der bliver brugt.
Kan ikke huske hvilket stof det var, men nogle af de generatorer kan yde ca 300w i mange år.
Kan ikke huske hvilket stof det var, men nogle af de generatorer kan yde ca 300w i mange år.
dub (4) skrev:Her er en [url= af afsendelsen.
Puha, den kunne da vist godt bruge et partikelfilter den der.
#7: Hvad med et link? ;)
Og er det ikke Pu239 der er "det sjove" - Hvis altså det er henfaldsvarmen fra plutoniummet der bruges til at skabe strøm?
Edit: Og jeg mener at Voyager-sonderne også brugte hvad der dengang blev kaldt et "plutonium-batteri" fordi solseller ikke er effektive så langt fra solen...
Og er det ikke Pu239 der er "det sjove" - Hvis altså det er henfaldsvarmen fra plutoniummet der bruges til at skabe strøm?
Edit: Og jeg mener at Voyager-sonderne også brugte hvad der dengang blev kaldt et "plutonium-batteri" fordi solseller ikke er effektive så langt fra solen...
#7: Nu blev jeg selv nysgerrig. Det kaldes åbenbart ikke et "batteri" med en Radioisotope Thermoelectric Generator (RTG) - Typisk NASA at finde på et så forkromet udtryk! ;)
I følge Wikipedia er det Pu238 der bruges.
Interessant nok blev der også brugt en RTG i Apollo 12-17 missionerne der udviklede 73W elektricitet og 1480W varme - Det ser ud til at det er normalt at der udvikles op til 20 gange mere varme end elektricitet. Og jeg troede at netop køling var et af de store problemer i rummet?
Og det slog mig lige at eftersom LM'en fra Apollo 13 brændte op i atmosfæren, blev RTG - og dens energikilde - spredt i atmosfæren - Ikke så rart selvom mængden ikke var så stor.
I følge Wikipedia er det Pu238 der bruges.
Interessant nok blev der også brugt en RTG i Apollo 12-17 missionerne der udviklede 73W elektricitet og 1480W varme - Det ser ud til at det er normalt at der udvikles op til 20 gange mere varme end elektricitet. Og jeg troede at netop køling var et af de store problemer i rummet?
Og det slog mig lige at eftersom LM'en fra Apollo 13 brændte op i atmosfæren, blev RTG - og dens energikilde - spredt i atmosfæren - Ikke så rart selvom mængden ikke var så stor.
Der skulle ikke være noget særligt radioaktivt i området hvor LM ramte ned så RTG ligger formodeligt "sikkert" 5-6 km under havoverfladen. Men NASA håber på at få fat i den.Mnemonic (11) skrev:Og det slog mig lige at eftersom LM'en fra Apollo 13 brændte op i atmosfæren, blev RTG - og dens energikilde - spredt i atmosfæren - Ikke så rart selvom mængden ikke var så stor.
Lorte telefon ... Suk ...
tl;dr
Voyager 1+2 brugte RTG, som stadig virker efter knap 40 år.
Gad ikke finde links, men fandt lige et par hurtige alligevel :)
link 1
link 1 ser ud til at fejle - der er kyrilliske bogstaver i ... Ih altså!
link 2
Link 2 er til en RTG, yder 300w fra starten - det bliver over tid mindre, alt efter halveringstiden på det man nu engang bruger ...
tl;dr
Voyager 1+2 brugte RTG, som stadig virker efter knap 40 år.
Gad ikke finde links, men fandt lige et par hurtige alligevel :)
link 1
link 1 ser ud til at fejle - der er kyrilliske bogstaver i ... Ih altså!
link 2
Link 2 er til en RTG, yder 300w fra starten - det bliver over tid mindre, alt efter halveringstiden på det man nu engang bruger ...
#5
Tror at han hentyder til Spirit og Opportunity, der blev estimeret til at holde 3 måneder men holdte i flere år
Tror at han hentyder til Spirit og Opportunity, der blev estimeret til at holde 3 måneder men holdte i flere år
SlettetBruger (15) skrev:Det giver en fantastisk følelse i kroppen at se sådan en takeoff helt ud i rummen.
Ja, sad også med en lidt tom fornemmelse inden i da jeg så den sidste shuttleopsendelse ... Skønt at DR HD havde gjort plads i programmet til det!
Vidste slet ikke noget om dette før nu.
Fantastisk!. Det vildt det kan lade sig gøre.
Landing ser vild complex ud. faldskærm... raket... så hejst ned med wire? (sådan viser de ihvertfalde i postet link). Gjorde de også sådan med de andre rovers?.
Og damn, den godt nok ikke lille. På størrelse med en golfbil.
Fantastisk!. Det vildt det kan lade sig gøre.
Landing ser vild complex ud. faldskærm... raket... så hejst ned med wire? (sådan viser de ihvertfalde i postet link). Gjorde de også sådan med de andre rovers?.
Og damn, den godt nok ikke lille. På størrelse med en golfbil.
Hvis du kan vente et sted i mellem 9 og 42 minutter cirka så er det ikke slemt. Men det er bedre end IP over brevdue.miicklol (18) skrev:Er der ikke temlig træls ping på mars?
kriss3d (21) skrev:Det gælder vel så bare om at dumpe massive mængder af CO2 op på mars. Så om et par års tid skulle vi kunne begynde at få regn og en atmosfære vi kan trække vejret i.
Så må vi bare håbe der ikke lige pludseligt dukker gamle artefakter op i udgravningerne der...
Eller på Phobos/Deimos
Wikipedia, Voyager I skrev:
the heat from the spheres generates approximately 157 watts of power (at launch) - 470 watts total from the three RTGs. The power output of the RTGs declines over time, but Voyager 1's RTGs will allow operations to continue until at least 2025
Ved godt at en RTG taber kraft over tid, men ikke desto mindre, så regner de (NASA) med at Voyager virker til 2025 - dvs 50 år!
Voyager I og II bruger Pu-238
....
Wikipedia, Pioneer 11 skrev:
Pioneer 11 used 4 SNAP-19 radioisotope thermoelectric generators (RTG) (see diagram). They were positioned on 2 three-rod trusses, each 3 meters (10 ft) in length and 120 degrees apart. This was expected to be a safe distance from the sensitive scientific experiments carried on board. Combined, the RTGs provided 155 watts at launch, and decayed to 140w in transit to Jupiter. The spacecraft required 100w to power all systems
Opsendt i 1973, mistede kontakten i 1995 - 22 år før energien faldt fra 155 watt til 100-ish ...
Pioneer 10 og 11 brugte Pu-238
...
Wikipedia, RORSAT skrev:
BES-5 types with a capacity of providing about two kilowatts of power
En russisk RTG som jeg ikke lige kunne finde nærmere info om (skide russere!) - men kan sige så meget at den bruger U-235
...
Wikipedia, GPHS-RTG skrev:
Each GPHS-RTG has a mass of about 57 kg and generates about 300 Watts of electrical power at the start of mission
Der står ikke hvor længe den virker, men bruger også Pu-238
...
Wikipedia, MMRTG skrev:
The MMRTG is designed to produce 125W electrical power at the start of mission, falling to about 100W after 14 years.
Pu-238 - okay, 14 år er ikke særlig meget, tab på 20% .. but still!
tl;dr
GUFANDEN kan NASA da lave noget fikundik så den søde lille robot vil kunne have strøm i mange år endnu.
Hvis de i midt 70'erne kunne lave en RTG der ydede 157 watt så burde man vel også kunne lave en der kunne give nok til Curiosity, evt sammen med solceller?
Dijkstra (24) skrev:Plutonium 238 har en halveringstid på godt 87 år. Så hvis batteriet levere 300W i dag, så levere det 150W om 87 år.
Atombatterier er ikke så rene, - men de levere varen!
Ved ikke helt om jeg vil give dig ret i det, da RTG'en jeg nævnte tabte 20% på 14 år ... Nu gider jeg ikke til at regne på det, men fra 150 til <100 på 20-40 år er vist en lidt kortere halveringstid?
Wikipedia, Pu-238 skrev:
American access to Plutonium-238 is the reason why it is the only country to have sent a science mission further than Mars, where solar power drops off rapidly.
Derfor har man ikke kombineret det med solceller ... Kunne jeg fandme da også ha sagt mig selv o_O
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