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Constant of the dayc·2,998 × 10⁸ m·s⁻¹
Year I · No. 152
— Natura non facit saltus —
Monday, 2 Nov 2026

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· Astrophysics · 02 · 11 · 2026

Blue halite in meteorite Sidi El Habib 001 reveals its space exposure history

A meteorite found in the Sahara desert, named Sidi El Habib 001, contains blue halite (common salt) that records a prolonged period of exposure to space. The study, published in Nature, analyses these salt crystals as natural archives of the meteorite's history before it fell to Earth.

§ Today’s briefing

5 dispatches · 02 · 11 · 2026

Pine Creek Gorge cuts a deep scar through the Allegheny Plateau

Pine Creek Gorge, in Pennsylvania, forms a deep scar in the Allegheny Plateau, a landscape highlighted by NASA in an autumn image. The valley stands out for the warm tones of the seasonal vegetation, which contrast with the cleft that water has carved into the plateau over thousands of years.

Known locally as the “Grand Canyon of Pennsylvania,” Pine Creek Gorge is one of the most recognizable landforms in the state. Its incised profile shows how fluvial erosion has worn down the rock of the Allegheny Plateau until opening a corridor of steep slopes.

“Pine Creek Gorge, in Pennsylvania, forms a deep scar in the Allegheny Plateau, a landscape highlighted by NASA in an autumn image.”
§ Technical sheet
Source
NASA
Category
General
Edition
Nº 152
Date
2026-11-02
Reading
1 min
Origin
Source ↗

§ arXiv briefing

— ex praeprintis hodiernis —
  1. 2610.42131 · cuantica

    Universal limit set on the speed of quantum evolution

  2. 2610.42120 · teoria

    Gaps of the unitary almost Mathieu operator are fully classified

  3. 2610.42103 · cuantica

    Symmetric mass generation preserves quantized charge pumping

  4. 2610.42143 · cuantica

    First measurement of strange-quark polarization in top-quark decays

  5. 2610.42037 · cuantica

    Lattice QCD closes in on the full meson spectrum

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