Perseverance’s radar revealed ancient subsurface river delta on Mars
There may be a river delta hidden under the obvious delta in a Martian crater.
https://arstechnica.com/science/2026/03/perseverances-radar-revealed-ancient-subsurface-river-delta-on-mars/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social