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SpaceX is set to launch four people into space Wednesday on a three-day mission that is the first to orbit the Earth with exclusively private citizens on board, as Elon Musk’s company enters the space tourism fray.

The Inspiration4 mission caps a summer that saw billionaires Richard Branson and Jeff Bezos cross the final frontier, on Virgin Galactic and Blue Origin spaceships respectively, a few days apart in July.

The SpaceX flight has been chartered by American billionaire Jared Isaacman, the 38-year-old founder and CEO of payment processing company Shift4 Payment. He is also a seasoned pilot.

The exact price he paid SpaceX hasn’t been disclosed, but it runs into the tens of millions of dollars.

The mission itself is far more ambitious in scope than the few weightless minutes Virgin Galactic and Blue Origin customers can buy.

The SpaceX Crew Dragon will be flying further than the orbit of the International Space Station.

“The risk is not zero,” said Isaacman in an episode of a Netflix documentary about the mission.

“You’re riding a rocket at 17,500 miles (28,000 kilometres) per hour around the Earth. In that kind of environment there’s risks.”

SpaceX has already given no fewer than ten astronauts rides to the ISS on behalf of NASA – but this will be the first time taking non-professional astronauts.

Lift-off is scheduled for Wednesday from 8:00 pm Eastern Time (5:30am IST) from launch pad 39A, at NASA’s Kennedy Center in Florida, from where the Apollo missions to the Moon took off.

‘Are we going to the Moon?’

In addition to Isaacman, who is the mission commander, three non-public figures were selected for the voyage via a process that was first advertised at the Super Bowl in February.

Each crew member was picked to represent a pillar of the mission.

The youngest, Hayley Arceneaux, is a childhood bone cancer survivor, who represents “hope.”

She will become the first person with a prosthetic to go to space.

“Are we going to the Moon?” she asked, when she was offered her spot.

“Apparently people haven’t gone there in decades. I learned that,” she laughed, in the documentary.  

The 29-year-old was picked because she works as a Physician Assistant in Memphis for St. Jude’s Hospital, the charitable beneficiary of Inspiration4.

One of the donors secured the seat of “generosity”: Chris Sembroski, 42, is a former US Air Force veteran who now works in the aviation industry.

The last seat represents “prosperity” and was offered to Sian Proctor, a 51-year-old earth science professor who, in 2009, narrowly missed out on becoming a NASA astronaut.

She will be only the fourth African American woman to go to space.

Months of training

The crew’s training has lasted months and has included experiencing high G force on a centrifuge – a giant arm that rotates rapidly.

They have also gone on parabolic flights to experience weightlessness for a few seconds and completed a high altitude, snowy trek on Mount Rainier in the northwestern United States.

They spent time at the SpaceX base, though the flight itself will be fully autonomous.

Over the three days of orbit, their sleep, heart rate, blood, and cognitive abilities will be analysed.

Tests will be carried out before and after the flight to study the effect of the trip on their body.

The idea is to accumulate data for future missions with private passengers.  

The stated goal of the mission is to make space accessible for more people, although space travel remains for the moment only partially open to a privileged few.

“In all of human history, fewer than 600 humans have reached space,” said Isaacman.

“We are proud that our flight will help influence all those who will travel after us.”

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NASA Solves Black Hole Jet X-ray Mystery with IXPE’s Polarization Powers

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May 9, 2025

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NASA Solves Black Hole Jet X-ray Mystery with IXPE’s Polarization Powers

The blazar BL Lacertae, a giant black hole with jets, facing the earth, have made scientists curious about how X-rays are generated in such extreme conditions for a while. NASA’s Imaging X-ray Polarimetry Explorer or IXPE now might have been able to solve the mystery. By a collaboration with radio and optical telescopes and using polarisation measurements of X-ray, IXPE’s produced results indicates that the interaction between fast-moving electrons and photons might be the reason for X-ray emission in such conditions.

Evidence of Compton Scattering

According to the IXPE’s findings, high optical to X-ray polarization ratio indicates that Compton scattering might be the mechanism of X-ray generation. There are two possible and competing explanations of X-ray emission in blazar jets. One saying if the X-rays in the black hole jets are highly polarised, then the X-rays are generated from interactions between photons while the other says a low polarisation indicates X-ray formation by electron-photon interaction.

Leveraging IXPE’s unique X-ray polarisation measuring ability, scientists conducted a focused observation on BL Lac in November 2023. During this period, BL Lac’s optical polarization peaked at 47.5%, the highest recorded for any blazar. Yet IXPE found the X-ray polarization to be much lower, capped at 7.6%. This contrast supports the Compton scattering and possibly irradicates the photon-based explanation.

Milestone for blazar studies

“This was one of the biggest mysteries about supermassive black hole jets,” said Iván Agudo, lead author of the study and astronomer at the Instituto de Astrofísica de Andalucía – CSIC in Spain. The discovery validates IXPE’s mission, launched in December 2021 to study X-ray polarization.

Astrophysicist Enrico Costa, called it one of IXPE’s most significant achievements. Yet, this is just the beginning. Project scientist Steven Ehlert noted the need to observe more blazars, as their emissions vary over time. With IXPE, astronomers are now better equipped to explore these powerful cosmic jets.

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SpaceX Falcon 9 Successfully Launches 28 Starlink Satellites to Orbit From Florida

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May 9, 2025

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SpaceX Falcon 9 Successfully Launches 28 Starlink Satellites to Orbit From Florida

SpaceX continued its rapid-fire Starlink deployment campaign on Tuesday night (May 6), lofting 28 more internet satellites to orbit atop a Falcon 9 rocket from Florida’s Cape Canaveral Space Force Station. The launch itself took place at 9:17 p.m. EDT (0117 GMT on May 7) from Launch Complex-40, marking the company’s 53rd Falcon 9 launch of 2025 and the 36th dedicated Starlink mission this year. The payload offers worldwide internet connectivity by adding to SpaceX’s swiftly expanding array of over 7,200 Starlink satellites in low Earth orbit.

As per a Space.com report, B1085, the reusable first-stage booster, executed a perfect main engine cut about 2.5 minutes after launch, then stage separation and a retrograde burn to stop its descent. Roughly eight minutes after launch, B1085 successfully landed on the autonomous drone ship, stationed in the Atlantic Ocean. The mission was the seventh flight for this particular booster, which had previously supported two other Starlink missions.

The Falcon 9‘s upper stage continued into orbit and deployed the 28 Starlink satellites roughly one hour after launch. These newly deployed units will spend several days adjusting their positions before integrating into the broader Starlink network, which now blankets most of the globe except the polar regions. Each satellite, compact but equipped with large solar arrays, forms part of the larger web responsible for delivering high-speed satellite internet.

The May 6 launch demonstrates how quickly SpaceX is moving to meet its broadband goals. In addition to Falcon 9 missions, the company has performed two Starship test flights this year to demonstrate development progress in both satellite launch and heavy-lift capability.

An expanding constellation would finally bring reliable internet coverage to remote locations around the world. The drive to offer a reliable internet connection to remote sites globally reflects a commitment to putting the world more in reach.

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Asteroid Vesta May Be a Fragment of a Lost Planet, Say Scientists

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May 9, 2025

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Asteroid Vesta May Be a Fragment of a Lost Planet, Say Scientists

Asteroid Vesta, long considered a stalled protoplanet, may actually be a massive fragment of a larger world that once existed in our solar system. New findings based on gravity-field mapping and spin-rate data suggest Vesta lacks the dense core typically found in differentiated planetary bodies. The discovery challenges previous assumptions, drawn from NASA’s Dawn mission in 2012, that classified Vesta as an embryonic planet. Now, scientists report that Vesta might have been ejected from a differentiated world in a massive collision 4.5 billion years ago, upending ideas about the development of planets and asteroids.

New Gravity Data Suggests Vesta Is Debris from a Destroyed Planet, Not a Protoplanet

As per a new study published in Nature Astronomy on April 23, 2025, Vesta does not quite match the former model. Refined calibration methods polished the radio Doppler signals, confirming the absence of a metal-rich core, which was inconsistent with earlier work. Seth Jacobson of Michigan State University, who led the research, stated the new interpretation marks a major shift in planetary science. While Vesta’s basaltic, volcanic surface still indicates geological activity, its internal uniformity contradicts the expectations of a body that once underwent full differentiation.

This paradox has caused scientists to reconsider the asteroid’s heritage. One scenario is that Vesta started to differentiate but never got very far. But data from meteorites called howardite-eucrite-diogenites (HEDs), thought to have come from Vesta, show no signs of such incomplete differentiation. Jacobson and his team instead favour the explanation that Vesta was formed from material blasted off a fully developed planet during an ancient planetary collision, which could also illustrate its volcanic surface without requiring it to have a dense core.

The results not only question Vesta’s identity but also suggest a possibility of a more general theory: that other asteroids could also be pieces of shattered planets. NASA’s Psyche and ESA’s Hera missions, planned for the next decades, intend to do such gravity investigations, which could ultimately confirm this new view. Jacobson noted that Vesta’s composition could even hint at a shared origin with Earth or other early planets, a hypothesis that may reshape asteroid science entirely.

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