We've seen helium baked off a rocky exoplanet's atmosphere

If the large, rocky planet is losing helium, then we can infer what is left behind. https://arstechnica.com/science/2026/07/weve-seen-helium-baked-off-a-rocky-exoplanets-atmosphere/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social