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Sealed capsules Sealed 195
Sealed in 15 February 2015 22:05:05
Opened at: 07 April 2018 13:30:00
Green Line - The Third Line of Sofia Subway is put into service. 550 000 passengers use the Sofia underground railway at 2018
The 16 km long third line is planned to connect Ovcha Kupel neighbourhood (in southwest Sofia) and Vasil Levski neighbourhood (in northeast Sofia), with 19 stations in total, including two transfer stations in the city centre, with both of the already operational lines. According to the Municipality, they estimate the line will be put into service by 2018.
There will be 8 overground and 11 underground stations. The project design contract was awarded to the Czech company Metroprojekt Praha a.s.
In March 2014, a tender for construction of the central section of the line was announced. The section is 7 km long and includes 7 stations, two of them transfer to lines 1 and 2. With the announcement of the tender it became clear, that the initial plans for 19 stations had been partly amended and 2 of the stations will be not be built, one at Doyran boulevard and another at Shipka street. The tunnel of the central section shall be excavated by a TBM, while the construction of stations shall be awarded to other companies. The construction of the section shall be completed within 45 months.In January 2015, a tender for 20 trains, that shall serve the central section of the line, was announced. Driverless train operation, with Grade of Automation 3 (GoA 3), and platform screen doors will ensure the safety of the passengers.
The Sofia subway will be used by 550 000 passengers in 2018, according to Stoyan Bratoev, Executive Director of municipality-owned company Metropoliten EAD.
In a Sunday interview for the Focus news agency, he said that the Sofia subway was being used by 80 000 a 300 000 passengers and their number was to reach 550 000 with the completion of the main part of the third subway line.
He said that the subway stations on the route to Sofia Business Park in the Mladost residential district and to Sofia Airport were being built, adding that their launch in 2014 was expected to boost the number of passengers by around 90 000 to a total of 380 000.
Bratoev noted that the third subway line was to bring 170 000 new passengers in 2018, provided that it was built in its entirety, or 110 000 extra passengers, provided that only the central part was built. …
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Owner: Thin Green Line
Owner: Thin Green Line
Sealed in 09 April 2017 02:43:35
Opened at: 01 April 2018 04:45:00
Photo of the year: First Detailed image of a Black Hole - Milky way's core
A supermassive black hole lurks at the center of our galaxy, but we’ve never seen it. We know it’s there, and that it has the mass of about 4 million suns, and that the stars in our galaxy revolve around it. But no one could tell you exactly what it looks like.
In fact, astronomers have never been able to snap a direct image of any black hole, ever. That’s because although the black holes at the center of galaxies are supermassive, they’re really far away. It’s akin to trying see a grapefruit, DVD, or bagel on the surface of the moon. You’d need a supermassive telescope, 1000 times the size of Hubble, to spot one.
Or, maybe, just eight telescopes working together. The Event Horizon Telescope (EHT), which is actually a network of eight radiofrequency observatories around the world, switched on for the first time on April 5. Between now and April 14, the observatories hope to gather enough data to piece together our first snapshot a black hole’s event horizon—the “point of no return” threshold after which nothing can escape the black hole’s gravity.
These telescopes will collect radio waves emitting from the supermassive black hole at the center of the Milky Way, as well as the neighboring galaxy Messier 87, and stitch them together into visual images. The EHT’s resolution is said to be about as good as being able to count the stitches on a baseball from 8,000 miles away.
Over at Nature, Davide Castelvecchi explains that instead of using just one very big mirror or antenna dish, the technique (called very-long-baseline interferometry) works by merging multiple observatories into “one virtual telescope—with an effective aperture as big as the distance between them.”
Heino Falcke, an astrophysicist at Radboud University in the Netherlands, told Popular Science that this project wouldn’t have been possible just a few years ago. The Atacama Large Millimeter Array, which has been fully operational since 2013, “adds a lot of sensitivity and image quality,” he says. “Also, we need to record and store an enormous amount of data—almost half a petabyte per telescope. That wasn’t feasible a few years ago.”
EHT’s goal isn’t just to see what our friendly neighborhood black hole is up to. The team, lead by astrophysicist Sheperd Doeleman at Harvard University, thinks that “seeing” a black hole for the first time could help lead to a theory of everything, uniting the laws that govern very small quantum mechanical physics with the laws that govern very big things in the universe.
The project also aims to learn more about how these gravitational anomalies pull in matter, and how they generate huge jets of plasma. It could also shed light on Stephen Hawking’s hypothesis that information that falls into a black hole must somehow leak back out.
After analyzing the vast amounts of data that will be generated by this experiment—about 2 petabytes for each of the four or five nights of observation—the EHT team hopes to have a picture ready in 2018.