Groups Similar Look up By Text Browse About

Similar articles
Article Id Title Prob Score Similar Compare
186709 THENEXTWEB 2020-7-31:
The dangers SpaceX’s Crew Dragon will face during its return to Earth
1.000 Find similar Compare side-by-side
186923 ARSTECHNICA 2020-8-2:
Dragonship Endeavour is flying free, on its way back to Earth
0.416 0.598 Find similar Compare side-by-side
186927 ARSTECHNICA 2020-8-2:
After a splendid flight test, NASA now has a new ride to space
0.327 0.578 Find similar Compare side-by-side
186728 THEVERGE 2020-7-31:
SpaceX’s Crew Dragon slated to bring NASA astronauts home for the first time this weekend
0.962 0.558 Find similar Compare side-by-side
186905 ARSTECHNICA 2020-7-31:
More quickly than anyone expected, NASA embraces reuse for human flights
0.610 0.512 Find similar Compare side-by-side
186760 ARSTECHNICA 2020-7-31:
Rocket Report: SpaceX seeks 20km hop license, why Rocket Lab funder left
0.189 0.447 Find similar Compare side-by-side
186554 ARSTECHNICA 2020-7-28:
Virgin Galactic’s spacecraft has six passenger seats and lots of windows
0.436 Find similar Compare side-by-side
186435 ARSTECHNICA 2020-7-29:
NASA set to launch its most complex, ambitious rover yet to Mars
0.410 Find similar Compare side-by-side
186752 ARSTECHNICA 2020-7-30:
SpaceX completes static fire of Starship prototype, will hop next
0.378 Find similar Compare side-by-side
186495 TECHREPUBLIC 2020-7-29:
Perseverance liftoff: How to watch the 2020 Mars rover launch
0.371 Find similar Compare side-by-side
186438 THEVERGE 2020-7-29:
A stowaway helicopter on NASA’s Mars rover will attempt the first flight on another world
0.355 Find similar Compare side-by-side
186916 ARSTECHNICA 2020-8-1:
The final launch to Mars for the next two years looked pretty epic
0.351 Find similar Compare side-by-side
187010 THENEXTWEB 2020-8-3:
The Perseverance rover is our best bet for finding life on Mars
0.283 Find similar Compare side-by-side
186634 TECHREPUBLIC 2020-7-28:
BlackBerry finds another automotive partner in electric vehicle startup Canoo
0.234 Find similar Compare side-by-side
186745 THEVERGE 2020-7-31:
Fisker hits snag in deal to use Volkswagen’s EV platform
0.232 Find similar Compare side-by-side
186984 THENEXTWEB 2020-8-2:
New 3D model reveals Venus’ volcanoes are actually still active
0.220 Find similar Compare side-by-side
186684 THEVERGE 2020-7-30:
FCC approves Amazon’s internet-from-space Kuiper constellation of 3,236 satellites
0.219 Find similar Compare side-by-side
187005 THENEXTWEB 2020-8-1:
Ultraviolet light gives astronomers new clues on mysterious stellar eruptions
0.218 Find similar Compare side-by-side
186543 ARSTECHNICA 2020-7-28:
This Toyota Yaris Hatchback just got cancelled, and that’s a shame
0.214 Find similar Compare side-by-side
186762 THEVERGE 2020-7-31:
GM will help EVgo triple its fast charger network in the US
0.210 Find similar Compare side-by-side
186933 ARSTECHNICA 2020-8-3:
SpaceX now plans for 5 million Starlink customers in US, up from 1 million
0.206 Find similar Compare side-by-side
186471 THEVERGE 2020-7-28:
BMW will make an all-electric 5 Series, 7 Series, and X1
0.204 Find similar Compare side-by-side
186568 VENTUREBEAT 2020-7-28:
Aquicore raises $14 million for AI tools to optimize commercial building energy usage
0.193 Find similar Compare side-by-side
186885 ARSTECHNICA 2020-7-31:
Human sperm swim more like otters than eels, study finds
0.190 Find similar Compare side-by-side
186426 THEVERGE 2020-7-29:
GM teases Hummer EV truck and SUV ahead of new late 2020 reveal date
0.185 Find similar Compare side-by-side


ID: 186709


Date: 2020-07-31

The dangers SpaceX’s Crew Dragon will face during its return to Earth

The Crew Dragon spacecraft, produced by private company SpaceX, is scheduled to return from the International Space Station (ISS) and splash down in the Atlantic ocean on August 2. Contingent on a favorable weather forecast and a successful final week at the ISS , NASA astronauts Robert Behnken and Douglas Hurley will begin the undocking procedure on August 1, and re-enter Earths atmosphere the next day – a total of 64 days since liftoff. The historic launch took place on May 30 from NASAs Kennedy Space Center in Florida, marking the first time a commercial space company has carried humans into orbit around Earth. But while the launch was a nail-biting experience to watch, reentry will be even more risky – presenting a tense moment for mission control. SpaceX founder Elon Musk said that the reentry is indeed his biggest concern. The joint SpaceX and NASA mission was successful in docking with the ISS, so that astronauts could complete scientific and maintenance work, including four spacewalks. Importantly, the missions primary purpose is to test and demonstrate the vehicles capability to safely carry crew to and from Earth orbit, as the first step in the plan of commencing regular ISS missions and commercial space flights. The UAEs Mars mission shows how space exploration can benefit small nations] The extreme velocities and temperatures the vehicle must endure present a major challenge to engineers and makes reentry the most perilous part of a mission. The danger starts with finding the right angle of the trajectory as the spacecraft enters the upper atmosphere. If it is too steep, the astronauts will experience potentially fatal g-forces, and the friction of the air drag could cause the spacecraft to explode. If it is too shallow, the capsule will instead catastrophically skip off the atmosphere and back into Earth orbit. The spacecraft will enter the upper atmosphere at 27,000km/hour. That is 7.5km/second, or more than 20 times the speed of sound. In whichever units you prefer – this is fast. At these velocities, a very strong shock wave forms around the front of the vehicle, compressing and superheating the air. Managing the immense thermal load is a huge reentry engineering challenge. At the most extreme stage, the temperature of the air in the shock layer exceeds 7,000°C. By comparison, the temperature at the surface of the Sun is around 5,500°C. This makes the vehicles heat shield so hot that it starts to glow — a process called incandescence. SpaceXs new and advanced PICA-X material heat shield has managed to protect the capsule in test flights, later being recovered in a very charred state. The air molecules around the vehicle also break down into positively charged atoms and free electrons – a so-called plasma. When some of the molecules recombine, excess energy is released as photons (light particles) – giving the air around the vehicle an amber glow. This plasma layer may be beautiful, but it can cause radio blackouts. When an electron travels along a conductive wire, we have electricity. Similarly, when free electrons move through the plasma around the vehicle, we have an electric field. If the electric field becomes too strong, it can reflect and attenuate the radiowaves trying to reach the spacecraft. Blackout not only leads to a loss of connection to on-board crew and flight data, it can also make remote control and guidance impossible. The Apollo missions, the Mars Pathfinder and the recent, failed 2018 Soyuz rocket launch all incurred communications blackout on the order of minutes. NASA mission control are anticipating a nervous six minutes of blackout during the peak heating phase of Crew Dragons return – if anything goes wrong during this time, its in the hands of the astronauts. Another risky stage is the parachute-assisted landing. The Crew Dragon will deploy four parachutes upon the final stage of reentry, as the vehicle descends toward a gentle splashdown in the Atlantic Ocean off the coast of Florida. This maneuver has been tested by SpaceX 27 times prior to next weeks crewed landing, so it should work. A successful landing will have huge implications – lowering the cost of space exploration through the use of reusable rockets and enabling private space exploration. While SpaceX engineered the Crew Dragon vehicle under contract to NASA, the company is free to use the spacecraft for commercial flights without NASA involvement after operational certification. SpaceX has a partnership with commercial aerospace company Axiom Space, which has the ultimate goal of building the worlds first commercial space station. The proposed commercial activities for the station are broad: from in-space research and manufacturing to space exploration support. Then there is space tourism. Private citizens are already queuing for their ticket to space, and with a successful Crew Dragon splashdown, they wont be waiting long. American space tourism company, Space Adventures (partnered with SpaceX), are planning to offer zero-gravity atmospheric flights, orbital flights with a spacewalk option and laps of the Moon by late 2021. Whether the costs, environmental impact, and dangers of spaceflight are justified for space tourism is debatable. As this articles shows, the required safety briefing for Space Adventure ticket holders will be much more comprehensive than your regular please take a moment to read the safety card in the seat pocket in front of you. This article is republished from The Conversation by Heather Muir, PhD in Computational Physics, University of Cambridge under a Creative Commons license. How to hide from drones in the age of surveillance Do you want to get the sassiest daily tech newsletter every day, in your inbox, for FREE? Of course you do: sign up for Big Spam here.