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Edited European Space Agency image of the density of stars from data from the Gaia Mission.
Image source: www.esa.int/spaceinimages/Images/2018/08/Star_density_map
Original caption: The second data release of ESA’s Gaia mission, made in April, has marked a turning point in the study of our Galactic home, the Milky Way. With an unprecedented catalogue of 3D positions and 2D motions of more than a billion stars, plus additional information on smaller subsets of stars and other celestial sources, Gaia has provided astronomers with an astonishing resource to explore the distribution and composition of the Galaxy and to investigate its past and future evolution.
The majority of stars in the Milky Way are located in the Galactic disc, which has a flattened shape characterised by a pattern of spiral arms similar to that observed in spiral galaxies beyond our own. However, it is particularly challenging to reconstruct the distribution of stars in the disc, and especially the design of the Milky Way’s arms, because of our position within the disc itself.
This is where Gaia’s measurements can make the difference.
This image shows a 3D map obtained by focusing on one particular type of object: OB stars, the hottest, brightest and most massive stars in our Galaxy. Because these stars have relatively short lives – up to a few tens of million years – they are mostly found close to their formation sites in the Galactic disc. As such, they can be used to trace the overall distribution of young stars, star formation sites, and the Galaxy’s spiral arms.
The map, based on 400 000 of this type of star within less than 10 000 light-years from the Sun, was created by Kevin Jardine, a software developer and amateur astronomer with an interest in mapping the Milky Way using a variety of astronomical data.
It is centred on the Sun and shows the Galactic disc as if we were looking at it face-on from a vantage point outside the Galaxy.
To deal with the massive number of stars in the Gaia catalogue, Kevin made use of so-called density isosurfaces, a technique that is routinely used in many practical applications, for example to visualise the tissue of organs of bones in CT scans of the human body. In this technique, the 3D distribution of individual points is represented in terms of one or more smooth surfaces that delimit regions with a different density of points.
Here, regions of the Galactic disc are shown with different colours depending on the density of ionising stars recorded by Gaia; these are the hottest among OB stars, shining with ultraviolet radiation that knocks electrons off hydrogen atoms to give them their ionized state.
The regions with the highest density of these stars are displayed in pink/purple shades, regions with intermediate density in violet/light blue, and low-density regions in dark blue. Additional information from other astronomical surveys was also used to map concentrations of interstellar dust, shown in green, while known clouds of ionised gas are depicted as red spheres.
The appearance of ‘spokes’ is a combination of dust clouds blocking the view to stars behind them and a stretching effect of the distribution of stars along the line of sight.
An interactive version of this map is also available as part of Gaia Sky, a real-time, 3D astronomy visualisation software that was developed in the framework of the Gaia mission at the Astronomisches Rechen-Institut, University of Heidelberg, Germany.
Further details including annotated version of the map: Mapping and visualising Gaia DR2
Id 397431
This is the mind-map that outlines the presentation that Renee Alexander, Chris Noble and I gave at BlogWorld 2010
Plenty of room on the inside, including a compartment for up to a 100 oz hydration reservoir such as this Camelbak.
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Supporting Map for Letterkenny Development Variation, (Area of Town Centre Extension).
The plans will be on display until the end of January 2006.
More information at www.donegal.ie/dcc/planning/lkennyplan2.htm and www.damienblake.com/2006/01/letterkenny-development-plan-...
July 24, 11:49
Position: 39.30N 52.34W
Weather: Clear, occasional rain, occasional cloud
Wind: W 15 to 19 knots
Heave: 2 m
We are in the high pressure system, but the weather is not stable.
The tide movement is affecting to our speed over the ground reads over 7 knots on GPS.
At this point, we still have west wind, thus we are sure that it was a good decision to go down south.
The fist storm that we had was showed on the weather map light blue and the size was much smaller than the one we had in winter, thus we thought it wouldn't be so bad. However, the wave was hard and it went over 5 m occasionally. This might be a character of the low pressure on the Atlantic.
This time we decided to go down south to avoid the strong wind according to the weather map. We will mark the longest Day run today!
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I just found this on the global site of LG Electronics (http://www.lge.com/general/lg_globalsite.jsp). This map links to the separate LG country sites, sorted by regions. Call me a total nerd, but check this out:
Instead of a reunified Germany, I'm seeing a thick border still running between former East Germany and West Germany (I grew up in East Germany, and I can testify that the reunification did happen.....17 years ago); instead of the Czech Republic and Slovakia, I still see the former Czechoslovakia (which ceased to exist more than 14 years ago...); the CIS is not a nation, it's a commonwealth of sovereign states - the LG map shows the former Soviet Union including the three Baltic states (that never belonged to the CIS but are members of the European Union) and Turkmenistan (which withdrew from the Commonwealth of Independent States in 2005). And: Since there's no separate LG country site for Iceland, I'm not going to mention that Iceland actually belongs to Europe and not to North America (Iceland gets tinted, too, when you roll over North America).
It appears that LG doesn't seem to acknowledge the global political situation after 1990. Sweet, sweet Cold War.
I actually kinda like these little bugs on the map if they just weren't of such a scandalous shame for a global company like LG. Nonetheless I tried to send them a mail thru their "Contact Us" mail form to suggest a slight revise of this map (hint, hint!), but their mail form was so badly coded that - after trying three times - I wasn't able to deliver the message to LG.
So let's just leave LG as the Sleeping Beauty and enjoy the good ol' times before the events of 1989.
A map from the Worldmapper World Population Atlas: www.worldpopulationatlas.org
(c) Sasi Research Group, University of Sheffield
The infamous house on the hill looms over Los Angeles like an old friend, long forgotten to time and sits empty waiting for anyone to fully understand the stories that the walls have witnessed first hand.
It was here Dr. Harold Perelson on the eve of December 6th, 1959 had gone mad, killing his wife with the intent of killing their three children as well. When the eldest daughter escaped and got help, Dr. Perelson had taken his life and let the house and its tragedies be lost to history.
Despite the house being handed over to a woman, and later her son, the house was left as a time capsule with no one daring to live within those walls since the murder all those decades ago. For the first time, the time capsule has been open and welcomed its first visitors outside of its owner to explore the ballroom on the top floor and old fashioned bar, the four master bedrooms, gorgeous staircase, and the evidence of life left behind.
Muni is testing an animated map showing the position of all the trains in the entire system.
This replaces a feed from Central Control that was hard to read, but had one advantage in showing whether trains were one or two-car.
What I really need that's not shown here are arrival times. Being able to see N-Judah's bunched up in the avenues doesn't tell me when the next one will arrive. And without any landmarks I can't use this to find a stop unless it's a station or at a line's outer terminal.
Like most of Muni the only directions given are Inbound and Outbound. One of the most common questions riders ask is which way is downtown, but rather than just say "downtown" riders are expected to learn Muni terminology.
I'm not actually at that location lol very near though :)
I'm loving this application. I never installed it on my Pearl. Was too slow & would never attempt that haha
Day 10 of my 30 days of watches is a side scrolling world map based on NASA's topo map. The current "noon" is highlighted under the yellow sun, so the map makes one rotation per day. The local time is displayed around the tropic of Capricorn. When the button is pressed the world spins to display the map.
Edited Hubble Space Telescope image of Jupiter and the Great Red Spot, projected (by NASA) from a sphere to a rectangle.
Jupiter is the king of the solar system, more massive than all of the other solar-system planets combined. Although astronomers have been observing the gas-giant planet for hundreds of years, it still remains a mysterious world.
Astronomers don't have definitive answers, for example, of why cloud bands and storms change colors, or why storms shrink in size. The most prominent long-lasting feature, the Great Red Spot, has been downsizing since the 1800s. However, the giant storm is still large enough to swallow Earth.
The Red Spot is anchored in a roiling atmosphere that is powered by heat welling up from the monster planet’s deep interior, which drives a turbulent atmosphere. In contrast, sunlight powers Earth's atmosphere. From Jupiter, however, the Sun is much fainter because the planet is much farther away from it. Jupiter's upper atmosphere is a riot of colorful clouds, contained in bands that whisk along at different wind speeds and in alternating directions. Dynamic features such as cyclones and anticyclones (high-pressure storms that rotate counterclockwise in the southern hemisphere) abound.
Attempting to understand the forces driving Jupiter's atmosphere is like trying to predict the pattern cream will make when it is poured into a hot cup of coffee. Researchers are hoping that Hubble's yearly monitoring of the planet—as an interplanetary weatherman—will reveal the shifting behavior of Jupiter's clouds. Hubble images should help unravel many of the planet's outstanding puzzles. This new Hubble image is part of that yearly study, called the Outer Planets Atmospheres Legacy program, or OPAL.