Recently inside the clean room at NASA's Goddard Space Flight Center in Greenbelt, Maryland, engineers successfully completed two deployments for the James Webb Space Telescope's "wings" or side portions of the backplane structure that fold up. The wings and telescope structure are essential because they make up the telescope's carbon fiber framework which will hold all 18 of the telescope's mirrors and the tower for the primary mirror.
"We deploy the wings one at a time. Each individual deployment can take up to 16 hours or more to complete," said Adam Carpenter, Mechanical Integration Engineer at Goddard, as he and other engineers prepared for the move. "It is a delicate operation requiring multiple groups to perform specific tasks."
Leading up to this test, engineers lined the telescope structure with cables. In space, these cables will enable the telescope to open up and will provide electrical signals to the active mirror segments. During the wing test, however, the engineers needed to make sure the cables did not block the deployment, and so the team arranged the cables carefully.
"The two wings of the telescope structure will eventually hold 6 of Webb's 18 primary mirror segment assemblies," said Carpenter said. "They are necessary so that the observatory can fold up in order to fit into the launch vehicle."
The James Webb Space telescope, once fully assembled, will be bigger than any rocket that can launch the telescope into space. So the engineering team designed the telescope to fold like origami to fit inside its Ariane 5 rocket. Once launched, Webb will be shipped out to its destination one million miles out in space.
Webb telescope's images will reveal the first galaxies forming approximately 13.5 billion years ago. The telescope will also see through interstellar dust clouds to capture stars and planets forming in our own galaxy. At the telescope's final destination in space, one million miles away from Earth, it will operate at incredibly cold temperatures of -387 degrees Fahrenheit, or 40 Kelvin. This is 260 degrees Fahrenheit colder than any place on the Earth’s surface has ever been.
The James Webb Space Telescope is the scientific successor to NASA's Hubble Space Telescope. It will be the most powerful space telescope ever built. Webb is an international project led by NASA with its partners, the European Space Agency and the Canadian Space Agency.
Source: press release
Recording electrical signals from inside a neuron in the living brain can reveal a great deal of information about that neuron’s function and how it coordinates with other cells in the brain. However, performing this kind of recording is extremely difficult, so only a handful of neuroscience labs around the world do it.
For years, computer users have been told they should have complicated passwords, including numbers, punctuation marks and other symbols, and upper- and lowercase letters. Despite those being hard to remember, people were told not to write their passwords down, and forced to make up new ones quite frequently. Users dutifully complied – by capitalizing the first letter of their passwords, adding a “1” or their birth year, or perhaps ending their password with an exclamation point.
What does this mean:
wht has Don Trm don nw?
You’ve probably decided the intended question is: “What has Donald Trump done now?”But how did you reach that conclusion? The word fragments could be part of many different words. You even expanded two almost identical fragments – “Don” and “don” – to different words – “Donald” and “done”.
The use of biofuels helps reduce human greenhouse gas emissions. That’s one reason why some petroleum companies offer petrol containing up to 10% ethanol (a biofuel). But if we are to have any real chance of avoiding catastrophic climate change, it is not enough to reduce our emissions; we must put the process into reverse.
You’re already familiar with substances that are crystals - think rock salt, or quartz. Typically, these materials are hard, brittle and inelastic, and crack or shatter irreversibly when struck or bent. Published this week, our new paper describes a new type of crystal: one that is flexible, and that can even be tied in a knot.
In early July, Google announced that it will expand its commercially available cloud computing services to include quantum computing. A similar service has been available from IBM since May. These aren’t services most regular people will have a lot of reason to use yet. But making quantum computers more accessible will help government, academic and corporate research groups around the world continue their study of the capabilities of quantum computing.
Right now, there are two ways to be safe crossing a road: Wait until no cars are close by, so there’s enough time to make it to the other side of the street – or communicate with oncoming drivers. As the number of pedestrian deaths on U.S. roads climbs, up 25 percent since 2010 to more than 5,000 people in 2015, the dawn of driverless cars offers the promise of improving that sad safety record.
It’s no secret that Silicon Valley employs many more men than women in tech jobs. What’s much harder to agree on is why.
Solar has become the world’s favourite new type of electricity generation, according to global data showing that more solar photovoltaic (PV) capacity is being installed than any other generation technology.
It may not be obvious while lying in the sun on a hot summer’s day, but a considerable amount of heat is also coming from below you – emanating from deep within the Earth. This heat is equivalent to more than three times the total power consumption of the entire world and drives important geological processes, such as the movement of tectonic plates and the flow of magma near the surface of the Earth. But despite this, where exactly up to half of this heat actually comes from is a mystery.