NASA's Perseverance rover has been exploring Mars' Jezero Crater, a promising site for finding ancient microbial life. It recently ventured beyond the crater's rim to the farthest west it's explored, capturing a selfie that showcases the scientifically compelling terrain. The image, composed of 61 images, reveals Perseverance in a rocky outcrop called 'Arathusa' within the 'Lac de Charmes' region. This area features rocks as large as skyscrapers, likely formed by a meteorite impact nearly 3.9 billion years ago. Ken Farley, Perseverance's deputy project scientist, notes that these rocks are some of the oldest the mission will investigate.
In addition to its scientific exploration, Perseverance collects rock core samples and analyzes their composition. It's currently studying rocky outcrops in the Arbot area before moving to a site called 'Gardevarri' to the south. Meanwhile, researchers studying satellite pollution have found concerning climate effects from megaconstellation launches.
A study published in the journal Earth's Future estimates that these launches will leave 870 metric tons of soot in the atmosphere annually by 2029. This pollution can remain in the upper atmosphere for years, causing more significant climate impacts than pollution at lower levels. The soot could reduce sunlight, leading to mild cooling effects on Earth's climate. However, Eloise Marais from University College London warns against complacency, emphasizing the potential for unintended environmental consequences.
Marais compares space industry pollution to an unregulated geoengineering experiment, urging early action to prevent a more serious issue. Megaconstellation launches accounted for 35% of the space sector's climate impact in 2020 and could rise to 42% by 2029. As the space industry expands, it's crucial to address these pollution concerns to ensure a sustainable future for both space exploration and Earth's climate.
