The Boötes Void: A Hole in the Universe 330 Million Light-Years Wide
A region that should contain tens of thousands of galaxies holds barely 60. If the Milky Way sat at its center, we wouldn't have known other galaxies existed.
Today’s hidden fact · Wednesday, July 8, 2026
Near a Black Hole, One Hour Can Equal Seven Years — and It's Not Fiction
Interstellar's famous time-slip is real physics. Clocks genuinely run slower in strong gravity — your GPS corrects for it every second.
The cosmos right now
NASA Picture of the Day
NGC 6188: Dragons of Ara
Where can you find dragons fighting in the night sky? In the southern constellation of the Altar: Ara. The dragons are, of course, actually made of suggestively shaped gas and dust. The celestial home of the mythological battling beasts is cataloged as NGC 6…
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Asteroids Passing Earth This Week
2007 AA2
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Previous facts
Mercury Is Shrinking — the Whole Planet Is Getting Smaller
As its giant iron core cools, Mercury contracts, wrinkling its crust into cliffs hundreds of kilometers long. The planet has lost up to 14 km of diameter.
Jupiter's Moon Europa Hides More Water Than All of Earth's Oceans Combined
Beneath Europa's frozen shell sloshes a salty ocean up to 150 km deep — kept liquid for billions of years and considered the best place to look for alien life.