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Interesting Maps
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,852 Mod ✭✭✭✭
Join Date:Posts: 89092
A million X-ray sources revealing the nature of the hot universe The satellite is 1.5 million kilometres away
More pictures.
http://www.mpe.mpg.de/7461950/erass1-presskit?c=450698The energetic universe as seen with the eROSITA X-ray telescope. The first eROSITA all-sky survey was conducted over a period of six months by letting the telescope rotate continuously, thus providing a uniform exposure of about 150-200 seconds over most of the sky, with the ecliptic poles being visited more deeply. As eROSITA scans the sky, the energy of the collected photons is measured with an accuracy ranging from 2% - 6%. To generate this image, in which the whole sky is projected onto an ellipse (so-called Aitoff projection) with the centre of the Milky Way in the middle and the body of the Galaxy running horizontally, photons have been colour-coded according to their energy (red for energies 0.3-0.6 keV, green for 0.6-1 keV, blue for 1-2.3 keV). The original image, with a resolution of about 10”, and a corresponding dynamic range of more than one billion, is then smoothed (with a 10’ FWHM Gaussian) in order to generate the above picture.The red diffuse glow away from the galactic plane is the emission of the hot gas in the vicinity of the solar system (the Local Bubble). Along the plane itself, dust and gas absorb the lowest energy X-ray photons, so that only high-energy emitting sources can be seen, and their colour appears blue in the image. The hotter gas close to the galactic centre, shown in green and yellow, carries imprinted the history of the most energetic processes in the life of the Milky Way, such as supernova explosions, driving fountains of gas out of the plane, and, possibly, past outburst from the now dormant supermassive black hole in the centre of the galaxy. Piercing through this turbulent, hot diffuse medium, are hundreds of thousands of X-ray sources, which appear mostly white in the image, and uniformly distributed over the sky. Among them, distant active galactic nuclei (including a few emitting at a time when the Universe was less than one tenth of its current age) are visible as point sources, while clusters of galaxies reveal themselves as extended X-ray nebulosities. In total, about one million X-ray sources have been detected in the eROSITA all-sky image, a treasure trove that will keep the teams busy for the coming years.
Credit: Jeremy Sanders, Hermann Brunner and the eSASS team (MPE); Eugene Churazov, Marat Gilfanov (on behalf of IKI)
Approximate break-down of sources:
77% Active Galactic Nuclei
20% stars with strong, magnetically active hot coronae
2 % clusters of galaxies
others: bright X-ray binaries, supernova remnants, extended star forming regions, transient (e.g. Gamma-Ray Bursts0 -
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JupiterKid wrote: »Places located in a direct line from the centre of Ireland.
Most seem plausible, but a bit puzzled as to why Cuba takes up so much space where I would have expected the USA to be.
Makes sense now why all the moroccan hash gets taxed in cork!0 -
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Yeah I think it can't be right, cuba does take up more than I thought but not that much, I know it would be effected by what map projection and you would have to draw on globe to get right but don't think it be that much.
In fact I think given googlemap uses Mercator or something very similar it should be right as it maintains angles but not enough of expert to say that for sure.
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Google Maps doesn't reflect the proper shape of the globe. To fly from Ireland to west Canada, for example, you fly over Greenland, because that's the shortest route. But on Google Maps, that turns into a curved line which looks way longer, but isn't. We know this because airlines hate spending money on fuel. Or here's the same thing going from west Canada to Poland -
I think the fact that the US slopes inwards is important here, because the lines tend to slope downwards too. So the arc from Ireland to the US would almost run parallel to the US coast - and again, you can see this on the globe above. also, Newfoundland blocks off a good chunk of the view, and it looks like only the south of Florida and the Keys are in direct "line of sight" from Ireland. And you can see that the part of Russia which is in a direct line to Ireland is actually Wrangel Island and Chukotka on the very far east.
But then the arc from Ireland to Cuba is quite wide as Cuba slopes inwards.
Edit - here's a globe centred on Ireland.
You can draw straight lines on that - and again, although America is almost over the horizon, you can see how very little of it is in direct view. Then you can just about make out the long inwards line of Cuba.
I think the chart is accurate actually.0 -
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,852 Mod ✭✭✭✭ Join Date:Posts: 89092
From https://www.bbc.com/news/science-environment-53119686
The Mariana Trench in the Pacific is the deepest ocean location on Earth - but very well mapped
One-fifth of Earth's ocean floor is now mapped at a resolution of 100m
The worlds largest ships would barely cover 4 pixels.
Over 99% of Mars is mapped to a resolution of 6m.
Project link https://seabed2030.gebco.net/ the Japanese want to map the oceans in the next decade.0 -
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Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,852 Mod ✭✭✭✭ Join Date:Posts: 89092
The second oldest known map of the moon dates from 1505 by Leonardo da Vinci.
A map of the moon with the rock carvings superimposed on it
The oldest at about 5,300 years is from the passage tomb at Knowth0 -
Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 90,852 Mod ✭✭✭✭ Join Date:Posts: 89092
https://phys.org/news/2015-11-earth-hidden-groundwater.htmlThe bigger part of the study is the "modern" groundwater story. The report shows that less than six per cent of groundwater in the upper two kilometres of the Earth's landmass is renewable within a human lifetime.
But what would the moo-cows drink up north :eek:0 -
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JupiterKid wrote: »Map showing all the river catchments in Ireland.
The Shannon catchment is in red (roughly in the Centre), that of the rivers Barrow, Nore and Suir are in pink, the Erne is in yellow and the Liffey and Boyle are in slightly different shades of pale green.
Totally late to this thread bit... I’d like to buy that map.. where’d you come by it? I cant see it online?0 -
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If I had to make a somewhat educated guess, I'd assume that whatever dataset he is using (or if he made it himself) includes every brook, stream, river, canal, and flow-off going.
Ordnance Survey Ireland make some data available openly. I've grabbed the the waterways dataset which has this note: "For each watercourse with a drainage basin ≥ 500 km2 the main drain class should be indicated." And just turned the labels on. So say for example the Tay and the Dalligan down in the bottom left, between Dungarvan and Waterford.
https://i.imgur.com/9DqFJzw.png
The Environment Protection Agency also provide GIS data openly including one called Geometric River Network, which seems more along the lines of what the map maker has used.Which will let you do something like this
https://i.imgur.com/DK5ZMuv.png
Comparing the dataset provided, to an actual paper ordnance survey map. Using Howth as an example, just because it is easy to identify. There are 5 nodes on the GIS data, on the map it has the Bloody Stream (runs under the golf course), it has one flowing out into Whitewater Brook, it has Ballsaggart Stream (not named but identifiable). It also has the waterway going through Howth into the harbour itself. Not named.
Could also be a load of hogwash and someone will come along to disprove and rip me apart shortly
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