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Category: satellites – Page 4

What do motion detectors, self-driving cars, chemical analyzers and satellites have in common? They all contain detectors for infrared (IR) light. At their core and besides readout electronics, such detectors usually consist of a crystalline semiconductor material.

Such materials are challenging to manufacture: They often require extreme conditions, such as a very high temperature, and a lot of energy. Empa researchers are convinced that there is an easier way. A team led by Ivan Shorubalko from the Transport at the Nanoscale Interfaces laboratory is working on miniaturized IR made of .

The words “quantum dots” do not sound like an easy concept to most people. Shorubalko explains, “The properties of a material depend not only on its chemical composition, but also on its dimensions.” If you produce tiny particles of a certain material, they may have different properties than larger pieces of the very same material. This is due to , hence the name “quantum dots.”

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WASHINGTON — Varda Space Industries secured a $48 million contract from the U.S. Air Force Research Laboratory to test military payloads on the company’s reentry capsules.

A California-based startup focused on in-space manufacturing, Varda Space developed a factory-in-orbit spacecraft — a compact, 120-kilogram satellite engineered to produce high-value materials such as pharmaceuticals in zero-gravity conditions. The materials are returned to Earth in a capsule built with advanced thermal protection materials developed by NASA to withstand reentry.

The four-year deal with AFRL, announced on Nov. 26, leverages Varda’s W-Series reentry capsules as platforms to test payloads at hypersonic speeds. The spacecraft are built on Rocket Lab’s Photon satellite bus.

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Starlink has received the green light from the US authorities to launch its direct-to-cell satellite service, but there are still a number of technical hurdles to overcome before it can actually be made fully available to users.

The US Federal Communications Commission (FCC) has now authorised Starlink, SpaceX’s Internet service provider, to roll out its direct-to-cell satellite service. The idea is to be able to make phone calls directly via satellite, wherever you are, especially in so-called dead zones not currently served by a regular cellular network, such as deserts, mountains or oceans. Indeed, the Starlink constellation of low-earth orbit satellites has the potential to offer worldwide cellular coverage.

Despite this authorization, there are still a number of hurdles to overcome before this service can see the light of day, as the FCC has not responded favorably to all Starlink’s requests. For example, in order to offer optimal telephony and live video services, it will be necessary to exceed current radio emission limits.

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A plan to use millions of smartphones to map out real-time variations in Earth’s ionosphere has been tested by researchers in the US. Developed by Brian Williams and colleagues at Google Research in California, the system could improve the accuracy of global navigation satellite systems (GNSSs) such as GPS and provide new insights into the ionosphere.

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A GNSS uses a network of satellites to broadcast radio signals to ground-based receivers. Each receiver calculates its position based on the arrival times of signals from several satellites. These signals first pass through Earth’s ionosphere, which is a layer of weakly-ionized plasma about 50–1500 km above Earth’s surface. As a GNSS signal travels through the ionosphere, it interacts with free electrons and this slows down the signals slightly – an effect that depends on the frequency of the signal.

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Data from NISAR will improve our understanding of such phenomena as earthquakes, volcanoes, and landslides, as well as damage to infrastructure.

We don’t always notice it, but much of Earth’s surface is in constant motion. Scientists have used satellites and ground-based instruments to track land movement associated with volcanoes, earthquakes, landslides, and other phenomena. But a new satellite from NASA and the Indian Space Research Organization (ISRO) aims to improve what we know and, potentially, help us prepare for and recover from natural and human-caused disasters.

The NISAR (NASA-ISRO Synthetic Aperture Radar) mission will measure the motion of nearly all of the planet’s land and ice-covered surfaces twice every 12 days. The pace of NISAR’s data collection will give researchers a fuller picture of how Earth’s surface changes over time. “This kind of regular observation allows us to look at how Earth’s surface moves across nearly the entire planet,” said Cathleen Jones, NISAR applications lead at NASA’s Jet Propulsion Laboratory in Southern California.

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New findings suggest our galaxy’s evolutionary history is strikingly different from all the others.

Researchers have found that there’s something highly unusual about the Milky Way that sets it apart from galaxies which, on a surface level, appear similar.

As detailed in three recent papers published in The Astrophysical Journal, a team of researchers examined a mountain of data as part of the Satellites Around Galactic Analogs (SAGA) survey, which was dedicated to comparing the Milky Way to 101 other galaxies that are similar in mass.

The distinction is technical but significant, the researchers say: they found that the Milky Way has surprisingly few smaller satellite galaxies compared to its peers — and some of them have mysteriously stopped forming new stars.

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For decades, scientists have used the Milky Way as a model for understanding how galaxies form. But three new studies raise questions about whether the Milky Way is truly representative of other galaxies in the universe.

“The Milky Way has been an incredible physics laboratory, including for the physics of galaxy formation and the physics of dark matter,” said Risa Wechsler, the Humanities and Sciences Professor and professor of physics in the School of Humanities and Sciences. “But the Milky Way is only one system and may not be typical of how other galaxies formed. That’s why it’s critical to find similar galaxies and compare them.”

To achieve that goal, Wechsler cofounded the Satellites Around Galactic Analogs (SAGA) Survey dedicated to comparing galaxies similar in mass to the Milky Way.

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Blue Origin today announced a multi-launch agreement to deliver multiple next-generation Block 2 BlueBird satellites to low Earth orbit (LEO) on New Glenn. All launches will occur over a multi-year period from Blue Origin’s Launch Complex 36 at Cape Canaveral Space Force Station.

AST SpaceMobile is building the first and only space-based cellular broadband network designed for both commercial and government applications. It will operate directly with everyday smartphones and allow seamless switching between terrestrial cell towers and satellite signals depending on location and coverage needs.

“New Glenn’s performance and unprecedented capacity within its seven-meter fairing enables us to deploy more of our Block 2 BlueBird satellites in orbit, helping provide continuous cellular broadband service coverage across some of the most in-demand cellular markets globally,” said Abel Avellan, Founder, Chairman, and CEO, AST SpaceMobile.

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SpaceX was founded to increase access to space and help make life multiplanetary.

In just this year, we’ve launched 114 successful Falcon missions and counting for our commercial and government customers, deployed ~1,700 @Starlink satellites to provide high-speed internet for millions of people all around the world, and made extraordinary strides developing Starship’s capability to return humanity to the Moon and ultimately send people to Mars.

If you want to join the team and help build a more exciting future, check out the latest job openings across the company → https://www.spacex.com/careers

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