purplecat

You're viewing

purplecat's journal
Create a Dreamwidth Account Learn More

Reload page in style: site light

Explanation: What are the unusual spots surrounding that galaxy? They are all images of the same supernova. For the first time, a single supernova explosion has been seen split into multiple images by the gravitational lens deflections of intervening masses. In this case the masses are a large galaxy and its home galaxy cluster. The featured image was captured last November by the Earth-orbiting Hubble Space Telescope. The yellow-hued quadruply-imaged Supernova Refsdal occurred in the early universe far behind the cluster. Measuring the locations and time-delays between the supernova images should allow astrophysicists to recover the amount of dark matter in the galaxy and cluster. With patience and luck, a fifth image of the supernova will also be recovered nearby in the next few years.

Follow this link for the full detail.

Crossposts: http://louisedennis.livejournal.com/286161.html

Flat | Top-Level Comments Only

From:

deinonychus-1.livejournal.com

That is very cool. :-)

From:

daniel-saunders.livejournal.com

This picture is, indeed, cool, but my brain spoiled it for me by starting to play the early eighties Doctor Who theme over it...

From:

purplecat

It's always a bit difficult that most of these images are visualisations of data, rather than actual "as if seen with the naked eye" images. It can definitely give some of them a rather artificial look.

From:

fififolle

That's crazy! Thanks for sharing.

Flat | Top-Level Comments Only

Profile

purplecat

April 2025

S	M	T	W	T	F	S
		1	2	3	4	5
6	7	8	9	10	11	12
13	14	15	16	17	18	19
20	21	22	23	24	25	26
27	28	29	30

Tags

100 papers [10]
absent friends [2]
academia [87]
- dead scientists [2]
- edinburgh informatics [3]
- groups
  - dream [2]
- impact [1]
- public understanding [28]
  - lego rover [21]
- publications [50]
- scientists
  - aaron sloman [1]
  - alan bundy [4]
  - douglas hofstadter [1]
  - john mccarthy [2]
- talks [22]
- teaching [1]
administrivia [1]
agents of shield [1]
ai [28]
- agents [24]
  - ail [9]
  - bdi [11]
    - goals [2]
  - groups [3]
  - languages
    - agentspeak [1]
    - oopl [1]
  - organisations [3]
- automated reasoning [7]
  - rippling [1]
  - sat [1]
  - smt [1]
- ethics [7]
- explainability [2]
- hybrid systems [1]
- knowledge representation [1]
- lego robots [1]
- planning [1]
- robotics [4]
aisb [10]
amazon [1]
anecdote [1]
arthuriana [6]
bernice summerfield [6]
- review [5]
birthday [11]
books [54]
- author
  - andrew cartmel [3]
  - ben aaronovitch [4]
  - c s lewis [1]
  - charlotte bronte [1]
  - craig hinton [2]
  - david mcintee [1]
  - david whittaker [1]
  - dorothy l sayers [1]
  - iain m banks [2]
  - ian rankin [2]
  - j r r tolkien [1]
  - jacqueline rayner [2]
  - jane austen [1]
  - jeff vandermeer [1]
  - jim mortimore [1]
  - jonathan blum [2]
  - justin richards [3]
  - kate orman [2]
  - kelly hale [1]
  - lance parkin [4]
  - lawrence miles [6]
  - mags halliday [5]
  - malcolm hulke [1]
  - marc platt [2]
  - mark michalowski [3]
  - mary stewart [1]
  - megan whalen turner [3]
  - michael moorcock [2]
  - neal stephenson [3]
  - paul cornell [4]
  - paul dale smith [5]
  - paul magrs [11]
  - philip purser-hallard [10]
  - phyllis ann karr [1]
  - rob shearman [3]
  - rosemary sutcliff [2]
  - sara paretskey [1]
  - shakespeare [1]
  - simon guerrier [2]
  - terrance dicks [2]
  - terry pratchett [1]
  - tolkien [3]
castle [1]
christmas [2]
class [7]
- review [7]
computer science [15]
- complexity theory [4]
- game theory [5]
  - economics [1]
- np problems [1]
- verification [3]
  - induction [1]
conferences [3]
- aamas [1]
- arw [1]
- clima [1]
conventions [6]
- eastercon [11]
  - 2010 [2]
  - 2011 [4]
  - 2012 [1]
  - 2015 [1]
- easteron
  - 2025 [1]
- lass o gowrie [1]
crochet [40]
- amigurumi [11]
- garment [5]
- moogly cal [8]
- non-euclidean [10]
current events [24]
dark [1]
- icons [1]
diary [14]
doctor who [958]
- books [45]
  - annual [8]
  - cover [50]
    - benny adventure [1]
    - eda [4]
    - misc [9]
    - missing adventure [1]
    - new adventure [10]
    - nuwho [2]
    - pda [7]
    - target [16]
  - edas [2]
  - nas [4]
  - new series [9]
  - pdas [1]
  - storybook [1]
  - time and relative disse [5]
- comic [10]
  - fifth doctor [2]
  - first doctor [2]
  - fourth doctor [2]
  - second doctor [2]
  - sixth doctor [2]
  - third doctor [1]
- costume bracket [115]
- factsheet [1]
- fandom [2]
- fanzine [8]
  - channel d [1]
  - dwb [2]
  - skaro [1]
  - tides of time [1]
  - web planet [4]
- fiction [1]
  - martha [1]
  - thirteen [1]
  - yaz [1]
- icons [66]
  - ace [1]
  - adric [1]
  - amy+rory+river [1]
  - barbara [1]
  - barbara+ian [1]
  - ben [1]
  - bill+nardole+twelve [1]
  - chang lee [1]
  - cybermen [1]
  - dalek [1]
  - dan [1]
  - doctor+master [1]
  - dodo [1]
  - eight [1]
  - eleven [1]
  - eleven+river [1]
  - faction paradox [1]
  - fifteen [1]
  - four [1]
  - four+leela [1]
  - four+sarah [1]
  - fugitive doctor [1]
  - graham+ryan [1]
  - harry [1]
  - ian [1]
  - ice warriors [1]
  - jamie [1]
  - jamie+victoria [1]
  - jamie+zoe [1]
  - jo [1]
  - katarina [1]
  - leela [1]
  - liz [1]
  - mel [1]
  - nardole [1]
  - nyssa [1]
  - one [1]
  - osgood [1]
  - peri [1]
  - polly [1]
  - romana [1]
  - romana1 [1]
  - romana2 [1]
  - ruby [1]
  - sara [1]
  - sarah [1]
  - sarah+three [1]
  - sea devils [1]
  - seven [2]
  - shalka [1]
  - silurians [1]
  - six [1]
  - sontarans [1]
  - steven [1]
  - susan [1]
  - tegan [1]
  - tegan+turlough [1]
  - the master [3]
  - thirteen+yaz [1]
  - three [2]
  - turlough [1]
  - two [1]
  - unit [1]
  - vicki [1]
  - victoria [1]
  - yaz [1]
  - zoe [1]
  - zygons [1]
- new series [6]
- nuwho rewatch [72]
- paper dolls [79]
- picture [209]
  - ainley master [2]
  - alien [1]
  - amy [1]
  - amy/rory [1]
  - barbara [1]
  - behind the scenes [13]
  - bill [1]
  - bonnie langford [1]
  - cast [3]
  - clara [1]
  - convention [1]
  - daphne ashbrook [1]
  - david tennant [1]
  - delgado master [3]
  - donna [2]
  - dvd cover [5]
  - dwm [4]
    - cover [2]
  - eighth doctor [1]
  - eleventh doctor [3]
  - eleventh doctor episo [6]
  - elizabeth sladen [1]
  - fanart [8]
  - fifth doctor [4]
  - fifth doctor episode [6]
  - fiftheenth doctor epi [1]
  - first doctor [4]
  - first doctor episode [15]
  - fourth doctor [5]
  - fourth doctor episode [7]
  - frazer hines [2]
  - fugitive doctor [1]
  - india fisher [1]
  - jamie [4]
  - jo [3]
  - joanna lumley [1]
  - jodie whittaker [4]
  - k9 [1]
  - leela [2]
  - martha [3]
  - matt smith [1]
  - mickey [1]
  - missy [1]
  - monster [13]
  - new adventures [1]
  - nicholas courtney [2]
  - nicola bryant [1]
  - ninth doctor [1]
  - ninth doctor episode [1]
  - patrick troughton [1]
  - paul mcgann [1]
  - pearl mackie [2]
  - peri [2]
  - peter capaldi [1]
  - production team [1]
  - puzzle [1]
  - river song [1]
  - romana [3]
  - romana 1 [1]
  - romana 2 [2]
  - rose [3]
  - rowan atkinson [1]
  - russell t davies [1]
  - sara [1]
  - sarah [4]
  - second doctor [6]
  - second doctor episode [7]
  - seventh doctor episod [6]
  - shalka doctor [1]
  - sixth doctor [5]
  - sixth doctor episode [4]
  - susan [1]
  - sylvester mccoy [2]
  - tardis [3]
  - tegan [2]
  - tenth doctor [2]
  - tenth doctor episode [9]
  - the brigadier [1]
  - the master [3]
  - theatre [2]
  - third doctor [5]
  - third doctor episode [2]
  - thirteenth doctor [2]
  - thirteenth doctor epi [2]
  - tom baker [2]
  - turlough [1]
  - tv movie [1]
  - twelfth doctor episod [3]
  - unit [1]
  - vicki [1]
  - victoria [3]
  - villain [1]
  - web planet [2]
  - william hartnell [2]
  - yaz [1]
  - zoe [1]
- rec [1]
- review [427]
  - book [34]
    - non-fiction [7]
  - film [1]
  - tv [393]
    - classic [150]
    - new new series [9]
    - new series [233]
- russell davies [3]
- steven moffat [2]
- the randomizer [152]
- verity podcast [1]
- whordle [4]
dolls [78]
- lego [5]
  - nasa [3]
- paper dolls [79]
dreamwidth [3]
edinburgh [8]
- festival [1]
exercise [18]
- running [37]
  - london marathon [19]
facebook [5]
faction paradox [3]
- review [3]
family [12]
- b [23]
  - animals [1]
  - dinosaurs [16]
  - fossils [4]
  - media stardom [19]
- cousins [1]
- days out [1]
- g [4]
  - school [1]
fandom [3]
fandom friday [2]
fandom stocking [1]
fanfiction [3]
feminism [5]
films [8]
follow friday [7]
food [51]
- heston blumenthal [1]
- recipe [40]
fools and heroes [11]
fossil friday [54]
friends [2]
genealogy [16]
granny's diary [5]
grimm [1]
- icons [1]
history [4]
holidays [56]
- cleveland way [5]
- cornwall [3]
- hadrian's wall [23]
- orkney [13]
- ridgeway [3]
- scotland [2]
- snowdonia [5]
- wales [2]
- west highland way [9]
house [16]
i have no tag for this [24]
i saw this last week [107]
icons [43]
- castle [1]
- ladybird books [1]
iris wildthyme [5]
- review [4]
jobs [3]
kin-strife [10]
linkspam [21]
livejournal [14]
lizzie bennet diaries [1]
mathematics [21]
- formal proof [1]
- logic [1]
- non-euclidean [10]
- philosophy [6]
  - proof [2]
- verification [1]
mcu [2]
- icons [1]
  - natasha [1]
media stardom [7]
meme [65]
meta [1]
model checking [4]
- systems
  - java pathfinder [3]
oxford [1]
performing [1]
- music [1]
philosophy [8]
- ai [2]
- ethics [2]
- mathematics [3]
picspam [101]
- castle [27]
- hobbit hole [6]
- house [2]
- prehistoric monument [92]
- roman remains [7]
- travel [56]
  - holidays [33]
  - work related [22]
pokemon go [2]
- icons [1]
primeval [59]
- fiction [1]
  - becker [1]
  - blade [1]
  - crossover [1]
  - lester [1]
  - ryan [1]
  - ryan/stephen [2]
- icons [4]
  - abby/ryan [1]
  - becker [1]
  - becker/lester [1]
  - becker/matt [1]
  - becker/ryan [1]
  - blade/lester [1]
  - claudia/lester [1]
  - connor [1]
  - connor/lester [1]
  - danny [1]
  - danny/ryan [1]
  - jess/ryan [1]
  - lester [1]
  - lester/ryan [1]
  - nick/stephen [1]
  - ryan [1]
- review [45]
programming [14]
- ail [1]
- languages
  - agentspeak [2]
  - jason [1]
  - java [5]
  - maude [2]
  - prolog [2]
projects
- eass [13]
- mcapl [13]
- platform grant [1]
- rais [2]
- verifiable autonomy [1]
- vps [2]
random doctor who picture [262]
random poetry [1]
rant [6]
reading listening watching [93]
rec [1]
- humour [1]
resolutions [14]
review [590]
- book [136]
  - non-fiction [37]
    - history [25]
      - science [9]
- comic [2]
- film [9]
- tv [409]
  - class [6]
  - internet [1]
  - merlin [2]
  - sarah jane adventures [5]
  - survivors [4]
roleplaying [24]
ros [1]
science [1]
science fiction [2]
science
- astronomy [1]
  - apod [1]
share
- twitter [2]
social networking [3]
- google+ [2]
- tumblr [1]
star wars [2]
- dolls [1]
  - lego [1]
the expanse [2]
- icons [1]
  - crew [1]
the prisoner [1]
- icons [1]
theorem proving [6]
- middle-out reasoning [3]
- proof planning [5]
  - critics [2]
  - rippling [3]
- proof specification lang [2]
- systems
  - isabelle [2]
  - isaplanner [4]
  - maude [1]
  - proof general [3]
- theory slicing [1]
- tptp thf [3]
throwback thursday [53]
- an oxford childhood [12]
- ancestors [3]
- arthurians [6]
- conventions [1]
- dad [3]
- docsoc [1]
- family [1]
- larp [3]
- oules [1]
- politics [1]
- running [1]
- wheatley [3]
tolkienery [7]
- fiction [1]
  - crossover [1]
  - sauron [1]
torchwood [5]
- review [13]
travel [65]
- commuting [2]
- work related [34]
traveller [6]
tv [29]
- blakes seven [1]
- buffy [1]
- firefly [2]
- sapphire and steel [1]
urban dead [5]
web stuff [1]
wierd spam [2]
world war z [1]
- fiction [1]
  - crossover [1]
writing [2]

Page Summary

Active Entries

Style Credit

Base style: Transmogrified by Yvonne
Theme: Sleeping Warrior by dancing_serpent

Expand Cut Tags

No cut tags

Top of page

Today's Astonomy Picture of the Day is pretty cool

(no subject)

(no subject)

(no subject)

(no subject)

Profile

April 2025

Tags

Page Summary

Active Entries

Style Credit

Expand Cut Tags