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Received yesterday β€” 12 December 2025

Elon Musk’s SpaceX Valued at $800 Billion, as It Prepares to Go Public

12 December 2025 at 19:55
A sale of insider shares at $421 a share would make Mr. Musk’s rocket company the most valuable private company in the world, as it readies for a possible initial public offering next year.

Β© Meridith Kohut for The New York Times

The SpaceX launchpad in South Texas in June 2024. The company said in a letter to employees on Friday that it could go public in 2026.
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Lego announces NASA Artemis SLS rocket set to lift off (literally) in 2026

4 December 2025 at 10:08

How do you top a highly detailed scale model of NASA’s new moon-bound rocket and its support tower? If you’re Lego, you make it so it can actually lift off.

Lego’s NASA Artemis Space Launch System Rocket, part of its Technic line of advanced building sets, will land on store shelves for $60 on January 1, 2026, and then β€œblast off” from kitchen tables, office desks and living room floors. The 632-piece set climbs skyward, separating from its expendable stages along the way, until the Orion crew spacecraft and its European Service Module top out the motion on their way to the moonβ€”or wherever your imagination carries it.

β€œThe educational LEGO Technic set shows the moment a rocket launches, in three distinct stages,” reads the product description on Lego’s website. β€œTurn the crank to see the solid rocket boosters separate from the core stage, which then also detaches. Continue turning to watch the upper stage with its engine module, Orion spacecraft and launch abort system separate.”

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Β© LEGO/collectSPACE.com

Was the Moon-Forming Protoplanet 'Theia' a Neighbor of Earth?

23 November 2025 at 18:30
Theia crashed into earth and formed the moon, the theory goes. But then where did Theia come from? The lead author on a new study says "The most convincing scenario is that most of the building blocks of Earth and Theia originated in the inner Solar System. Earth and Theia are likely to have been neighbors." Though Theia was completely destroyed in the collision, scientists from the Max Planck Institute for Solar System Research led a team that was able to measure the ratio of tell-tale isotopes in Earth and Moon rocks, Euronews explains: The research team used rocks collected on Earth and samples brought back from the lunar surface by Apollo astronauts to examine their isotopes. These isotopes act like chemical fingerprints. Scientists already knew that Earth and Moon rocks are almost identical in their metal isotope ratios. That similarity, however, has made it hard to learn much about Theia, because it has been difficult to separate material from early Earth and material from the impactor. The new research attempts a kind of planetary reverse engineering. By examining isotopes of iron, chromium, zirconium and molybdenum, the team modelled hundreds of possible scenarios for the early Earth and Theia, testing which combinations could produce the isotope signatures seen today. Because materials closer to the Sun formed under different temperatures and conditions than those further out, those isotopes exist in slightly different patterns in different regions of the Solar System. By comparing these patterns, researchers concluded that Theia most likely originated in the inner Solar System, even closer to the Sun than the early Earth. The team published their findings in the journal Science. Its title? "The Moon-forming impactor Theia originated from the inner Solar System."

Read more of this story at Slashdot.

The Moon Was an Inside Job

20 November 2025 at 14:00
New research suggests that Theia, the object whose collision with Earth is theorized to have caused the formation of the moon, came from closer to the sun.

Β© Mark A. Garlick/MPS

Artist’s impression of the collision between the early Earth and Theia, with the sun in the far distance, roughly 100 million years after the formation of the solar system.
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