Distance scales from the Planck length to a 93-billion-light-year observable universe expose extreme limits of physics and ...

The observable universe is vast, extending about 93 billion light-years across, containing galaxies, stars, planets, and all of the observable phenomena that make up our cosmic home. But what exists ...

Scientists are relatively certain that the observable universe is relatively flat, but in terms of the cosmos’s global topography, uncertainty reigns. A new study from an international scientific ...

Imagine being able to gaze at the very edge of the observable universe and witness a dazzling array of galaxies. NASA has now made this extraordinary experience possible by releasing an expansive map ...

How many atoms are there in the observable universe? Current estimates point to a number we would write as 1 followed by 80 zeroes, or 10 80. If you peered inside each of these atoms and counted their ...