Rocket Science and Propulsion

Subterms

    Latest story

    113 Shares88 Views

    SpaceX Polaris Dawn Spacewalk: How to Watch the Astronauts

    by

    The astronauts of the Polaris Dawn mission, after traveling through heavy radiation and high orbits, are getting ready to open the hatch of their SpaceX vehicle.Early Thursday morning, four private astronauts circling far above Earth will try something daring — let all the air out of their spacecraft.That will be a prelude for two of the astronauts, who will then venture outside for the first commercial spacewalk ever, an event that is to be the highlight of the Polaris Dawn mission led by Jared Isaacman, a billionaire entrepreneur.When is the spacewalk and how can I watch it?The spacewalk is scheduled to begin at 2:23 a.m. Eastern time. SpaceX plans to broadcast live coverage starting one hour before the spacewalk begins.If needed, a backup opportunity is available on Friday at the same time.What will happen during the spacewalk?Because there is no airlock in the SpaceX Crew Dragon spacecraft used for the flight, the only way to perform a spacewalk is to let all the air out of the spacecraft, and then open one of the hatches. That requires all four crew members to wear spacesuits.NASA and Soviet astronauts conducted spacewalks in a similar manner in the 1960s.As the Crew Dragon swings around Earth in an elliptical orbit that swings as close as 120 miles to the surface and as high as 460 miles, Mr. Isaacman and Sarah Gillis, a SpaceX engineer, will exit the capsule for about 15 to 20 minutes each.They will pass through the hatch at the top of the Crew Dragon with the help of a handrail that SpaceX has named Skywalker, moving around carefully and deliberately. The two will not be outside the spacecraft at the same time.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

    More stories

    • 138 Shares85 Views

      in Elections

      Polaris Dawn Astronauts in SpaceX Dragon Reach Record Orbit Above Earth

      by

      After launching early on Tuesday, the billionaire Jared Isaacman and his crew traveled to altitudes not visited by any astronaut since the Apollo moon missions of the 1960s and ’70s.Four private astronauts aboard an ambitious space mission led by a billionaire entrepreneur traveled farther from Earth on Tuesday than any other human being in more than half a century.Two of them, Sarah Gillis and Anna Menon, have now gone farther from the planet than any other women ever.The mission, named Polaris Dawn, lifted off through a break of favorable weather before sunrise on Tuesday. The flight had been grounded for nearly two weeks by unsettled weather in and around Florida.The astronauts, flying an elliptical path around Earth in a SpaceX Crew Dragon capsule, looped outward as far out as 755 miles above the planet’s surface. The mission’s orbits were carefully planned to reduce the hit of radiation the crew would absorb, and to minimize the chances of being struck by tiny bits of rock crisscrossing the solar system.The journey on Tuesday was only a small fraction of the nearly quarter million miles that NASA’s Apollo astronauts traveled to the moon. But after the last mission going there in 1972, humanity has stayed close to our planet, not venturing beyond orbits a few hundred miles up.The Polaris Dawn mission, led by Jared Isaacman, founder of the payment services company Shift4, is a collaboration with SpaceX, the rocket company founded by Elon Musk. It is the first of three missions designed to spur technological advances needed for Mr. Musk’s ambition to send people to Mars eventually.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

    • 113 Shares125 Views

      in Elections

      Starliner Capsule Returns, but Boeing’s Space Business Woes Remain

      by

      The capsule, which returned without astronauts, and other space programs at Boeing have suffered many delays and cost overruns.Space programs are a small part of Boeing’s business, which is dominated by sales of commercial and military planes and equipment. But the work is a point of pride: Boeing has long been involved in spaceflight, going back to the first mission to take an American to space.But Boeing’s efforts to add to that space heritage are in doubt.The company’s Starliner capsule returned to Earth safely from the International Space Station on Friday night, but without the two astronauts it took up there in June because NASA was concerned about thrusters on the capsule that had malfunctioned before it docked at the station.A decade ago, NASA chose Boeing and an upstart rival, SpaceX, to ferry astronauts to and from the space station. SpaceX has since carried out seven of those missions and will bring home the astronauts Starliner left behind, while Boeing has yet to complete one. And with the station set to retire as soon as 2030, time is running out.“It’s unclear if or when the company will have another opportunity to bring astronauts to space,” Ron Epstein, an aerospace and defense analyst at Bank of America, said in a research note last month. “We would not be surprised if Boeing were to divest the manned spaceflight business.”On Thursday, asked to comment on Starliner’s problems and the future of its space business, Boeing responded with this statement: “Boeing continues to focus, first and foremost, on the safety of the crew and spacecraft. We are executing the mission as determined by NASA, and we are preparing the spacecraft for a safe and successful uncrewed return.”Boeing’s troubles could be a setback not only for the company but for the U.S. space program more broadly, which wants multiple private companies available to ably support its efforts.We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

    • 163 Shares189 Views

      in Elections

      Final Delta IV Heavy Launch: Finale for a Rocket That Brings the Heat

      by

      The ignition of the Delta IV Heavy rocket is perhaps the most visually striking liftoff you’ll ever see — the rocket seemingly burns itself up on the launchpad before it heads to space. Now, the very last Delta IV Heavy ever is on the launchpad.Liftoff is scheduled for 1:40 p.m. Eastern time from Cape Canaveral, Fla., although winds and clouds could keep the rocket on the ground for another day or a bit longer. Forecasts give only a 30 percent chance of favorable weather. Conditions are expected to be better during backup launch opportunities.“A bittersweet moment for us,” Tory Bruno, the chief executive of United Launch Alliance, the maker of the Delta IV Heavy, said during a news conference on Wednesday ahead of the flight, which is carrying a secret spy satellite for the National Reconnaissance Office. “This is such an amazing piece of technology. Twenty-three stories tall. Half a million gallons of propellant. A quarter million pounds of thrust.”When it does launch, it will look as if it is catching on fire, with flames racing up the sides. That is by design.Fiery scenes from a Sept. 24, 2022, liftoff of a Delta IV Heavy rocket. Video by United Launch AllianceThe Delta IV Heavy burns ultracold liquid hydrogen, which is a high-performance fuel. In the final part of the countdown, to cool down the engines and prevent a sudden temperature shock that could cause cracks, liquid hydrogen starts flowing through the engine into the flame trench.But when the hydrogen warms above its boiling temperature of minus 423.2 degrees Fahrenheit, it turns into a gas. Hydrogen is lighter than air and rises upward. When the engines ignite, so does that cloud of hydrogen — like a space-age Hindenburg.“A very dramatic effect,” Mr. Bruno said.The rocket designers of course took this into account and applied sufficient insulation to the boosters to keep the rocket from actually burning up. The orange shade of that exterior takes on a burned-marshmallow sheen as the rocket leaves the Earth.“And away she goes,” Mr. Bruno said.Photographs by United Launch Alliance. Mobile photo illustration by Antonio de Luca. More

    • 113 Shares109 Views

      in Elections

      Jeff Bezos’ Blue Origin Rocket Moves Closer to Launch

      by

      Blue Origin’s New Glenn rocket rolled to the launchpad for a series of tests in preparation for its maiden flight later this year.There’s an easy knock against the space dreams of Jeff Bezos and his rocket company, Blue Origin: In its 24th year of existence, the company has yet to launch a single thing to orbit.Blue Origin’s accomplishments to date are modest — a small vehicle known as New Shepard that takes space tourists and experiments on brief suborbital jaunts. By contrast, SpaceX, the rocket company started by the other high-profile space billionaire, Elon Musk, today dominates the launch market.On Wednesday, Blue Origin hopes to change the narrative, holding a coming-out party of sorts for its new big rocket.In the morning, at Launch Complex 36 at the Cape Canaveral Space Force Station in Florida, the doors to a giant garage opened. The rocket, as tall as a 32-story building, lay horizontally on the trusses of a mobile launch platform.The contraption was sitting on a transport mechanism that resembles several long mechanical centipedes, but with wheels, 288 in all, instead of feet. It began rolling slowly out and up a concrete incline, a quarter-mile trip toward the launchpad.The rocket will undergo at least a week of tests before returning to the garage.“I’m very confident there’s going to be a launch this year,” Dave Limp, the chief executive of Blue Origin, said in an interview. “We’re going to show a lot of progress this year. I think people are going to see how fast we can move.”We are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More

    • 138 Shares199 Views

      in Elections

      SpaceX to Launch Intuitive Machines Nova-C Moon Lander: How to Watch

      by

      A day after SpaceX called off the flight of a spacecraft from Intuitive Machines of Houston, the company is ready to begin its lunar journey.Another month, another day, another try at the moon.A robotic lunar lander is scheduled to launch in the early morning hours of Thursday, one day after a technical glitch postponed the first launch attempt. If all goes well, it will become the first American spacecraft to set down softly on the moon’s surface since the Apollo 17 moon landing in 1972.It is also the latest private effort to send spacecraft to the moon. Earlier attempts have all ended in failure. But the company in charge of the latest effort, Intuitive Machines of Houston, is optimistic.“I feel fairly confident that we’re going to be successful softly touching down on the moon,” said Stephen Altemus, the president and chief executive of Intuitive Machines. “We’ve done the testing. We’ve tested and tested and tested. As much testing as we could do.”The Nova-C moon lander is about the size of a British phone booth according to Intuitive Machines. This particular lander is named Odysseus.Brandon Thibodeaux for The New York TimesExecutives at Intuitive Machines said they have tested their spacecraft extensively, but all other private lunar landers so far have failed to make the journey successfully.Intuitive MachinesWe are having trouble retrieving the article content.Please enable JavaScript in your browser settings.Thank you for your patience while we verify access. If you are in Reader mode please exit and log into your Times account, or subscribe for all of The Times.Thank you for your patience while we verify access.Already a subscriber? Log in.Want all of The Times? Subscribe. More