At these heights, the atmosphere is cold enough that clouds are typically composed of ice crystals, not water droplets. These clouds often look thin, wispy, and delicate—but they can provide valuable ...

At 300 light-years away, the interstellar cloud is the closest of its kind ever found to Earth and the largest apparent single structure in the sky.

One of the largest structures in the sky, as seen from our perspective, has only just been discovered. It’s an enormous cloud ...

Researchers are working to unravel the hidden biology of often-persnickety seeds as they age, sleep and awaken ...

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