OrbitalHub

Wikipedia dicit:

Dream Chaser Tenacity (DC101) is the first Dream Chaser spacecraft expected to fly in space. Manufactured by the Sierra Nevada Corporation, it will first fly to the International Space Station as part of the SNC Demo-1 mission in 2025, under the CRS-2 contract.

The Sierra Nevada Corporation was awarded a CRS-2 contract for by NASA for six operational resupply spaceflights to the International Space Station. SNC Demo-1 is a demo flight that will precede the operational resupply flights if the mission is successful.

Tenacity and other Dream Chasers will be mated with a Shooting Star module, which will provide an additional 10,000 lb (4,500 kg) of payload capacity, in addition to the 2,000 lb (910 kg) carried by the space plane. The module will be separated from the Dream Chaser prior to reentry and burn up in the atmosphere, while the Dream Chaser vehicle will perform a runway landing to be reused.

Dream Chaser is an American reusable lifting-body space plane developed by Sierra Space. Originally intended as a crewed vehicle, the Dream Chaser Space System is set to be produced after the Dream Chaser Cargo System cargo variant is operational. The crewed variant is planned to carry up to seven people and cargo to and from low Earth orbit. Sierra plans to manufacture a fleet of the space plane.

The Dream Chaser was originally started in 2004 as a project of SpaceDev, a company that was later acquired by the Sierra Nevada Corporation (SNC) in 2008. In April 2021 the project was taken over by the Sierra Space Corporation (SSC), which at that time was spun off from the Sierra Nevada Corporation as its own fully independent company.

The cargo Dream Chaser is designed to resupply the International Space Station with both pressurized and unpressurized cargo. It is intended to be launched vertically on the Vulcan Centaur rocket and autonomously land horizontally on conventional runways. A proposed version to be operated by European Space Agency (ESA) would launch on an Arianespace vehicle.

The Dream Chaser space plane is designed to be launched on the top of a typical rocket and land like an airplane on a runway. The design has heritage going back decades. Currently, the Dream Chaser will resupply the ISS with cargo.

On-orbit propulsion of the Dream Chaser was originally proposed to be provided by twin hybrid rocket engines capable of repeated starts and throttling. At the time, the SSC’s predecessor, the SNC was also developing a similar hybrid rocket for Virgin Galactic’s SpaceShipTwo. In May 2014, SNC involvement in the SpaceShipTwo program ended.

After the acquisition of Orbitec LLC in July 2014, Sierra Nevada Corporation announced a major change to the propulsion system. The hybrid rocket engine design was dropped in favor of a cluster of Orbitec’s Vortex engines. The new unit would be a pressure-fed three-mode engine. At low- and mid-power regimes it uses monopropellant fuel – hydrogen peroxide – and in high-power demand, the engine adds injection of RP-1 fuel. This increased thrust will be useful to shorten the de-orbit burn duration of the Dream Chaser.

Its thermal protection system (TPS) is made up of silica-based tiles (for most of the belly and upper portion of the heat shield), and a new composite material called Toughened Unipiece Fibrous Reusable Oxidation Resistant Ceramic (TUFROC) to cover the nose and leading edges.

In 2019, it was announced that an expendable Shooting Star cargo module would be part of the Dream Chaser cargo system for CRS-2 flights. The module is a 15-foot-long (4.6 m) attachment to Dream Chaser that will allow the spacecraft to carry an additional 10,000 pounds (4,500 kg) of pressurized and unpressurized cargo to ISS. The module supports disposal of unwanted cargo by burning up upon re-entry.

In addition to carrying cargo, the Shooting Star module includes solar panels that supply up to 6 kW of electrical power. It also supplies active and passive thermal management; provides Dream Chaser translation and rotation capability via six mounted thrusters; and supports berthing or docking (in different configurations) to the ISS. Access from ISS to Dream Chaser will involve crew passing through Shooting Star (which supports a shirt-sleeve environment) and through a hatch that separates Shooting Star from Dream Chaser. Sierra Nevada says the module is capable of additional types of missions in LEO or to cis-lunar destinations; they have developed a free-flying variant with additional capabilities.

Video credit: Sierra Space

Wikipedia dicit:

Extravehicular activity (EVA) is any activity done by an astronaut in outer space outside a spacecraft. In the absence of a breathable Earthlike atmosphere, the astronaut is completely reliant on a space suit for environmental support. EVA includes spacewalks and lunar or planetary surface exploration (commonly known from 1969 to 1972 as moonwalks). In a stand-up EVA (SEVA), an astronaut stands through an open hatch but does not fully leave the spacecraft. EVAs have been conducted by the Soviet Union/Russia, the United States, Canada, the European Space Agency and China.

On March 18, 1965, Alexei Leonov became the first human to perform a spacewalk, exiting the Voskhod 2 capsule for 12 minutes and 9 seconds. On July 20, 1969, Neil Armstrong became the first human to perform a moonwalk, outside his lunar lander on Apollo 11 for 2 hours and 31 minutes. In 1984, Svetlana Savitskaya became the first woman to perform a spacewalk, conducting EVA outside the Salyut 7 space station for 3 hours and 35 minutes. On the last three Moon missions, astronauts also performed deep-space EVAs on the return to Earth, to retrieve film canisters from the outside of the spacecraft. American Astronauts Pete Conrad, Joseph Kerwin, and Paul Weitz also used EVA in 1973 to repair launch damage to Skylab, the United States’ first space station.

EVAs may be either tethered (the astronaut is connected to the spacecraft; oxygen and electrical power can be supplied through an umbilical cable; no propulsion is needed to return to the spacecraft), or untethered. Untethered spacewalks were only performed on three missions in 1984 using the Manned Maneuvering Unit (MMU), and on a flight test in 1994 of the Simplified Aid For EVA Rescue (SAFER), a safety device worn on tethered U.S. EVAs.

Video credit: SpaceX

Wikipedia dicit:

Boeing Crew Flight Test (Boe-CFT) is the first crewed mission of the Boeing Starliner capsule. Launched on 5 June 2024, the mission flew a crew of two NASA astronauts, Barry E. Wilmore and Sunita Williams, from Cape Canaveral Space Force Station to the International Space Station. The crew’s return to Earth, a planned 14 June ground landing in the American Southwest, has been delayed while Boeing works to diagnose various problems with the spacecraft.

The crewed flight test was initially planned to occur in 2017, but various delays pushed back the launch. The spacecraft’s first two uncrewed orbital flight tests of the capsule, Boe-OFT and Boe-OFT 2, took place in 2019 and 2022.

The spacecraft was integrated with the Atlas launch vehicle on 16 April 2024 in preparation for launch. The flight was scheduled for 7 May 2024 but was scrubbed about two hours before liftoff due to an oxygen valve problem on the United Launch Alliance’s (ULA) Atlas V. After the initial scrub, the launch was repeatedly delayed due to a helium leak in the Starliner service module. The second launch attempt was on 1 June, but was scrubbed 3 minutes, 50 seconds before liftoff when the ground launch sequencer computer registered a loss of redundancy due to a faulty power supply. The third launch attempt, on 5 June at 14:52 UTC, was successful.

During the flight to the ISS, additional helium leaks were discovered, though these were still too small to threaten the mission. As Starliner approached the ISS, five reaction control system thrusters failed, likely unrelated to the helium leaks. Resetting and firing the thrusters eventually made four out of five work again, and the Starliner safely docked with the ISS after a delay. The thruster malfunction looks identical to unresolved problems encountered during OFT 2 and will likely have to be fixed before Starliner is certified by NASA.

As of 23 June 2024, the spacecraft remains docked to the ISS. The return to earth flight was originally scheduled for 14 June, but is postponed indefinitely to some time in July, while the problems so far discovered are reviewed for the safety of the return flight.

Video credit: NASA’s Kennedy Space Center

Wikipedia dicit:

The Lunar Terrain Vehicle (LTV) is an unpressurized rover being developed for NASA that astronauts can drive on the Moon while wearing their spacesuits. The development of the LTV is a part of NASA’s Artemis Program, which involves returning astronauts to the Moon, specifically the lunar south pole, by 2026, but the LTV will not fly until Artemis V in 2030 at the earliest. The LTV will be the first crewed lunar rover developed by NASA since the Lunar Roving Vehicle used during the Apollo program.

On February 6, 2020, NASA issued a request, seeking industry feedback on relevant state-of-the-art commercial technologies and acquisition strategies for a new Lunar Terrain Vehicle. NASA also stated in the request that they want the new LTV to draw on recent innovations in electric vehicle energy storage and management, autonomous driving, and extreme environment resistance.”

On August 31, 2021, NASA released another request to private companies for additional input on approaches and solutions for a vehicle to transport Artemis astronauts around the lunar south pole. NASA also asked if American companies are interested in providing the LTV as a commercial service, or as a product NASA would purchase and own.

On November 2, 2022, NASA issued a draft request for proposals (RFP) for the LTV as a service (LTVS). The draft was open for feedback until December 1, with a planned final RFP release date of on or about February 8, 2023, a proposals due date approximately 30 days later, and an anticipated contract award date of on or about July 19.

On January 27, 2023, NASA published an update stating that it anticipated that the LTVS final RFP release will be delayed until no later than May 26. On May 26, NASA released its services request for the Lunar Terrain Vehicle, with proposals due on July 10 and a contract award scheduled for November. On October 30, NASA delayed the award of the contract to March 31, 2024, to allow additional time to evaluate proposals.

On April 3, 2024, NASA announced that Intuitive Machines, Lunar Outpost and Venturi Astrolab are the three companies developing the LTV as part of a 12-month feasibility and demo phase. A source selection statement by NASA provided further details on cost and overall feasibility on 9 April, 2024. The Intuitive Machines proposal was for $1.692 billion, Lunar Outpost for $1.727 billion and Astrolab for $1.928 billion to develop the vehicle.

Video credit: NASA

Wikipedia dicit:

Solar sails (also known as lightsails, light sails, and photon sails) are a method of spacecraft propulsion using radiation pressure exerted by sunlight on large surfaces. A number of spaceflight missions to test solar propulsion and navigation have been proposed since the 1980s. The first spacecraft to make use of the technology was IKAROS, launched in 2010.

A useful analogy to solar sailing may be a sailing boat: the light exerting a force on the large surface is akin to a sail being blown by the wind. High-energy laser beams could be used as an alternative light source to exert much greater force than would be possible using sunlight, a concept known as beam sailing. Solar sail craft offer the possibility of low-cost operations combined with high speeds (relative to chemical rockets) and long operating lifetimes. Since they have few moving parts and use no propellant, they can potentially be used numerous times for the delivery of payloads.

Solar sails use a phenomenon that has a proven, measured effect on astrodynamics. Solar pressure affects all spacecraft, whether in interplanetary space or in orbit around a planet or small body. A typical spacecraft going to Mars, for example, will be displaced thousands of kilometers by solar pressure, so the effects must be accounted for in trajectory planning, which has been done since the time of the earliest interplanetary spacecraft of the 1960s. Solar pressure also affects the orientation of a spacecraft, a factor that must be included in spacecraft design.

Video credit: NASA’s Ames Research Center

They will always be remembered…

Apollo 1 (January 27, 1967)

Virgil “Gus” Grissom – Commander, Edward White – Command Pilot, Roger Chaffee – Pilot

STS-51 L (January 28, 1986)

Francis R. Scobee – Commander, Michael J. Smith – Pilot, Judith A. Resnik – Mission Specialist 1, Ellison Onizuka – Mission Specialist 2, Ronald E. McNair – Mission Specialist 3, Gregory B. Jarvis – Payload Specialist 1, Sharon Christa McAuliffe – Payload Specialist 2

STS-107 (February 1, 2003)

Rick D. Husband – Commander, William C. McCool – Pilot, Michael P. Anderson – Payload Commander, David M. Brown – Mission Specialist 1, Kalpana Chawla – Mission Specialist 2, Laurel Clark – Mission Specialist 3, Ilan Ramon – Payload Specialist 1

Video credit: NASA