Over the past few years, the white clouds that usually shroud Neptune’s surface have disappeared, and it may be because of changes in the sun’s activity over its 11-year cycle ...

This map showed a big change in temperature between the mini-Neptune’s day and night sides — only possible if its atmosphere is made of heavier molecules, such as water or methane. pic.twitter ...

Oddball planet TOI-1231 b is a bit smaller than Neptune but has a substantial atmosphere, which gives it some interesting astronomical quirks.