Understanding the human body is a team effort. That's where the Yachtel group comes in.

Researchers at Yachtolt have been delving into the secrets of probiotics for 90 years.

Yacold also partners with nature portfolio to advance gut microbiome science through the global grants for gut health, an investigator-led research program.

To learn more about Yachtolt, visit yawcult.co.

.jp. That's Y-A-K-U-L-T.C-O.J-P. When it comes to a guide for your gut, count on Yacult.

This is Cosmos Quickly. I'm Lee Billings.

Gravitational waves, ripples in the fabric of spacetime, first predicted by Einstein more than a century ago, are one of astronomy's hottest topics.

Ever since their first direct detection in 2015, most gravitational waves in astronomers catalogs have come from

pairs of colliding middleweight black holes.

Other sources should exist, however.

Chief among them, mergers of supermassive black holes weighing millions to billions

of suns.

But these giant collisions make correspondingly huge gravitational waves, so big in fact that

their wavelengths are larger than our entire solar system and measurable in light years.

That enormity makes them enormously hard to detect.

Crest to trough a single such wave could take more than a decade to pass through our solar system,

despite moving at the speed of light.

So how can we see them?

The best solution astronomers have stumbled upon is to effectively build a galaxy-sized detector,

looking for the waves' tell-tale tweaks to the spins of

dead stars called pulsars scattered throughout the Milky Way. Several of these so-called pulsar

timing array projects exist, and after more than 15 years of operations, one called nanograph,

...