Mars’s Ancient Rock: A 4-Billion-Year-Old Clue to the Red Planet’s Past

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Mars’s Ancient Rock: A 4-Billion-Year-Old Clue to the Red Planet’s Past

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Show notes A rose-coloured rock picked up in the Sahara in 2022 turns out to be one of the oldest pieces of Mars ever found. Teghaza 001 formed at least 4.1 billion years ago, and two independent radiometric clocks agree. We explain how it was dated, what it says about early Mars losing its water, and why its source is still a shortlist of 13 craters in the southern highlands. Also: Voyager 1 goes silent for two days and recovers on its own as it nears one light-day from Earth on 18 November; Hubble finally sees the 'Cat's Tail' of Beta Pictoris, the wreckage of a collision between two Pluto-sized worlds; two Halloween ghosts in the Carina Nebula; and quick hits on the 100th US spacewalk from the ISS, Reid Wiseman's move to JPL, Swift and Starship. Skywatch: US clocks go back on 1 November, Saturn in the evening, Venus returns to the morning sky, Mars and Jupiter close in, the Moon passes Pollux, Mars, Jupiter and Regulus, the Southern Taurids, and Carina for southern observers.

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