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Life, Unbounded

Interstellar Space Can Be Pebbly

Are there interstellar pebbles here? The red strands of dense interstellar grains seen with the Green Bank raio telescope (Credit: S. Schnee, et al.; B. Saxton, B. Kent (NRAO/AUI/NSF); We acknowledge the use of NASA's SkyView Facility located at NASA Goddard Space Flight Center.)

We’re used to thinking of the space between the stars as void, bereft of all but the most sparsely distributed atoms and molecules, or the occasional microscopic grain of silicon or carbon dust. Even the densest cores of nebula – molecular clouds – only attain average densities of a few million atoms or molecules per [...]

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