This Week in Space & Science

A meteorite recovered from the Sahara delivered the first direct chemical evidence that a Mars-sized protoplanet once orbited the young Sun before being destroyed in a collision. The fragment preserves isotopic signatures never before seen in solar-system materials, confirming long-standing models of early planetary formation and giant impacts.

Astronomers also reported the first detection of outflowing winds from Sagittarius A*, the Milky Way’s central black hole, after a fifty-year search. Meanwhile, JWST observations of interstellar comet 3I/ATLAS revealed methane production rates far higher than any solar-system comet, pointing to a formation environment chemically distinct from our own. These findings collectively sharpen our picture of how planets, stars, and even black holes shape their surroundings.

Top Stories

Sahara meteorite records a destroyed Mars-sized world. Analysis of the fragment shows oxygen and chromium isotope ratios that match no known asteroid or planetary body. Researchers conclude the parent body formed within the first few million years of the solar system and was later shattered, providing the first tangible sample of such an object.

Interstellar comet 3I/ATLAS blasts out unusual methane. JWST spectra captured methane venting at levels never recorded in solar-system comets. The extreme outgassing suggests the comet formed in a colder, more carbon-rich environment beyond its original star, offering a rare window into extrasolar chemistry.

Milky Way’s central black hole finally shows its winds. Fifty years of searches ended with the detection of streaming gas outflows from Sagittarius A*. The winds appear weaker than those around distant supermassive black holes yet confirm that even our relatively quiet galactic center drives feedback into its surroundings.

Seven hot Jupiters display clearest exoplanet magnetic fields yet. High-resolution spectroscopy of wind patterns on these ultra-hot worlds revealed magnetic interactions strong enough to shape atmospheric circulation. The data supply the strongest indirect evidence of magnetism outside the solar system.

Blue Origin targets New Glenn return to flight by year-end. Damage from a launch-pad incident was limited to the gantry; propellant tanks and processing facilities survived intact. The company plans repairs and renewed testing to keep the heavy-lift rocket on schedule for its first orbital mission.

Mission Updates

• Roman Space Telescope: Launch now set for 30 August aboard Falcon Heavy; final instrument checks complete.
• MAVEN: Continues long-term monitoring of Mars atmospheric loss; recent livestream confirmed healthy instruments after more than a decade in orbit.
• Ariane 6: Next flight scheduled 17 June in most powerful configuration carrying 36 Kuiper satellites.
• Starlink: Group 17-47 deployed into polar orbit from Vandenberg on 3 June.

Research Spotlight

The Sahara meteorite study combined high-precision oxygen and chromium isotope measurements with petrologic analysis. By comparing the fragment’s composition against all known meteorite groups and planetary samples, researchers demonstrated it could only have originated inside a differentiated, Mars-sized body that experienced core formation before disruption. The finding supplies the first empirical anchor for models of giant-impact phases in terrestrial-planet formation and suggests similar lost worlds may have contributed to the final assembly of Earth and Mars.

Night Sky This Week

Venus and Jupiter reach conjunction in the western evening sky, with Mercury climbing higher each night through mid-June. The three planets remain visible to the naked eye or with binoculars from mid-northern latitudes whenever the western horizon is clear. No equipment beyond a good viewing site is required.

Launch Calendar

• 17 June: Ariane 6 VA269 (36 Kuiper satellites) – most powerful configuration to date.
• 30 August: Nancy Grace Roman Space Telescope aboard Falcon Heavy.
• Ongoing: Additional Starlink missions scheduled to maintain constellation coverage.

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