Logarithmic Maps of the Universe (2005)

twic 5 years ago |

I got one of these printed by a banner-printing service who could do prints two metres tall and 60 cm wide or something. It came back with the bottom third blank - there are so many objects in the postscript file, it crashed their rasteriser. This was a cheap service, so they didn't check it before printing it out.

I rasterised it in software, and sent them the image, and that was fine.

Aerroon 5 years ago |

If anyone looked for Andromeda and couldn't find it: M31 is Andromeda and it's around 765 kiloparsecs away.

divbzero 5 years ago |

The lower bound on this map’s logarithmic scale is ~1000 km. I’d love to see it extended down to the Planck length.

7373737373 5 years ago | |

Not quite the same concept, but close: https://htwins.net/scale2/

nlitsme 5 years ago | |

Yeah, and then the origin should be moved to somewhere on the surface of the earth, instead of it's core.

082349872349872 5 years ago | | |

compare (1957) https://ned.ipac.caltech.edu/level5/Boeke/frames.html "The Universe in 40 jumps"

10e-13 cm to 10e26 cm

enriquto 5 years ago | | |

what do you mean? There's no "origin" on a logarithmic map, it's infinite both ways

crubier 5 years ago | | |

The map is relative to one location. You don’t want to see « rocks » and « rocks » for any distance smaller than 6000km, you want to see everyday objects. So you want the origin to be on earth surface

enriquto 5 years ago | | |

ok, I get it. It could be centered on a cell of your own body!

dash2 5 years ago | | |

https://www.youtube.com/watch?v=0fKBhvDjuy0

divbzero 5 years ago | | |

Yes! Maybe centered on an up quark in a proton of a carbon atom in the DNA in the nucleus of a brain cell.

privong 5 years ago |

Neat map.

The page's link to the journal article is broken. The abstract can be viewed on NASA's ADS[0] or directly via the DOI link[1] (which connects to the current home of the Astrophysical Journal).

[0] https://ui.adsabs.harvard.edu/abs/2005ApJ...624..463G/abstra...

[1] https://ui.adsabs.harvard.edu/link_gateway/2005ApJ...624..46...

teraflop 5 years ago | |

And here's the corrected arXiv link: https://arxiv.org/abs/astro-ph/0310571

folli 5 years ago |

Can someone ELI15 the horizontal axis to me (24h..6h)?

ajross 5 years ago | |

The "longitude" of astronomy is called "right ascension" and is traditionally counted as a 24 hour circle: https://en.wikipedia.org/wiki/Right_ascension

sideshowb 5 years ago |

Why is there a band of decelerating matter right near the top? I thought it was all accelerating outwards?

Also what's the gap between the blue bits?

astro123 5 years ago | |

The early universe's expansion was not accelerating, as the early universe was not dominated by dark energy. I don't know off the top of my head exactly when that changed, but z=0.76 seems about right. So I'm pretty sure that is what that is.

The reason the dominant form of matter changes is fairly simple. As the universe expands, the amount of matter doesn't change, so the matter density goes as 1/r^3. The amount or radiation goes as 1/r^4 as there is an extra loss of energy due to redshifting (E = hc/wavelength). Dark energy though is (we think) a constant, so as the universe expands, the amount of it stays constant.

sideshowb 5 years ago | | |

That took a long time to process! What's z? Your username checks out :-)

terramex 5 years ago | |

The gap is part of the universe we have trouble seeing because it is obscured by Milky Way.

lmilcin 5 years ago |

It is interesting to see that the biggest distance, in terms of orders of magnitude, is between Sol system and nearest stars.

p1mrx 5 years ago |

I would like to see a map of the universe scaled by population, similar to http://www-personal.umich.edu/~mejn/election/2016/

Mayzie 5 years ago | |

Opening that link, I just get presented with a login page.

p1mrx 5 years ago | | |

Your browser is probably redirecting to the broken HTTPS version.

https://www.businessinsider.com/2016-election-results-maps-p... has the same maps.

xingyzt 5 years ago |