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Discovery of Massive Stars Stripped of Hydrogen Envelopes in Binary Systems

“This was such a big, glaring hole,” said Dr. Maria Drout. “If it turned out that these stars are rare, then our whole theoretical framework for all these different phenomena is wrong, with implications for supernovae, gravitational waves, and the light from distant galaxies. This finding shows these stars really do exist.”


Can binary stars steal material from each other? This is what a recent study published in Science hopes to address as a team of international researchers examined how the interaction between binary stars can cause one star to strip material from its companion star over time, resulting in one massive star and one much smaller star. While this study could help astronomers better understand precursor signs to supernovae, scientists have only identified one candidate for being stripped of its hydrogen material, despite longstanding hypotheses that one in three binary stars are stripped of their hydrogen.

Physics behind Unusual Behavior of Stars’ Super Flares discovered

Our sun actively produces solar flares that can impact Earth, with the strongest flares having the capacity to cause blackouts and disrupt communications—potentially on a global scale. While solar flares can be powerful, they are insignificant compared to the thousands of “super flares” observed by NASA’s Kepler and TESS missions. “Super flares” are produced by stars that are 100–10,000 times brighter than those on the sun.

The physics are thought to be the same between solar flares and super flares: a sudden release of magnetic energy. Super-flaring stars have stronger magnetic fields and thus brighter flares but some show an unusual behavior—an initial, short-lived brightness enhancement, followed by a secondary, longer-duration but less intense flare.

Jeff Bezos plays down AI dangers and says one trillion humans could live in huge cylindrical space stations

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Artificial intelligence is more likely to save humanity than to destroy it, Jeff Bezos said recently. The billionaire also said he would like to see the human population grow to one trillion, with most people living in huge cylindrical space stations.

In an interview with podcaster Lex Fridman, the Amazon AMZN, +1.73% founder and former CEO rejected the idea that humans should colonize other planets, saying he believes building space colonies is the only way to achieve such population growth.

NASA’s Space Station Laser Comm Terminal Achieves First Link

A NASA technology experiment on the International Space Station completed its first laser link with an in-orbit laser relay system on Dec. 5, 2023. Together, they complete NASA’s first two-way, end-to-end laser relay system.

NASA’s LCRD (Laser Communications Relay Demonstration) and the new space station demonstration, ILLUMA-T (Integrated LCRD Low Earth Orbit User Modem and Amplifier Terminal), successfully exchanged data for the first time. LCRD and ILLUMA-T are demonstrating how a user mission, in this case the space station, can benefit from a laser communications relay located in geosynchronous orbit.

U.S. Space Command declares ‘full operational capability’

WASHINGTON — U.S. Space Command, the Defense Department’s combatant command responsible for space operations, has achieved full operational capability, its commander Gen. James Dickinson announced Dec. 15.

In short, this means that U.S. Space Command is now fully up and running. It has the staff, infrastructure and plans it needs to handle its mission of conducting space operations and protecting American and allied assets and interests in space.

U.S. Space Command, established in 2019 in Colorado Springs, is tasked to monitor space activity and threats, support other military units with space capabilities like communications and surveillance, respond to crises involving space, deter aggression and defeat enemies if needed.

Stellar Winds Regulate Growth of Galaxies

Galactic winds enable the exchange of matter between galaxies and their surroundings. In this way, they limit the growth of galaxies, that is, their star formation rate. Although this had already been observed in the local universe, an international research team led by a CNRS scientist1 has just revealed — using MUSE, 2 an instrument integrated into the European Southern Observatory’s (ESO) Very Large Telescope — the existence of the phenomenon in galaxies which are more than 7 billion years old and actively forming stars, the category to which most galaxies belong.

The team’s findings, to be published in Nature on 6 December 2023, thus show this is a universal process.

Galactic winds are created by the explosion of massive stars.

Saturn’s icy moon hosts vital life source, key molecule, reveals NASA

NASA’s Cassini probe has uncovered compelling evidence hinting at the potential existence of life on Saturn’s icy moon Enceladus.


Interestingly, a detailed review of Cassini’s data has revealed that the subsurface ocean hidden beneath the moon’s frozen surface is a rich source of chemical energy.

This disclosure strengthens the case for exploring the possibility of life within the ocean of this frozen celestial body.

According to the research, the more chemical energy there is on this moon, the higher the likelihood that life could flourish and endure.

Physicist Discovers ‘Paradox-Free’ Time Travel Is Theoretically Possible

No one has yet managed to travel through time – at least to our knowledge – but the question of whether or not such a feat would be theoretically possible continues to fascinate scientists.

As movies such as The Terminator, Donnie Darko, Back to the Future and many others show, moving around in time creates a lot of problems for the fundamental rules of the Universe: if you go back in time and stop your parents from meeting, for instance, how can you possibly exist in order to go back in time in the first place?

It’s a monumental head-scratcher known as the ‘grandfather paradox’, but a few years ago physics student Germain Tobar, from the University of Queensland in Australia, worked out how to “square the numbers” to make time travel viable without the paradoxes.

Artificial Afterlives

The afterlife Jones made.


For as long as we have had history and likely before, people have contemplated a life after this one, but might we one day create artificial afterlives? And if so, will we create heavens or hells?\
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Credits:\
Artificial Afterlives \
Science \& Futurism with Isaac Arthur\
Episode 399, June 15, 2023\
Written, Produced \& Narrated by Isaac Arthur\
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Editors:\
Dillon Olander\
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Graphics by: \
Jeremy Jozwik\
Ken York\
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Music Courtesy of\
Markus Junnikkala, \

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