From the category archives:

The 100(+) Greatest

The Greatest Images and Imaginations in Astronomy and Space Exploration

Olbers’ Paradox of Infinite Daylight

But we do have darkness! What gives? Now, old Olbers was certainly not some sort of nineteenth century nut case. Still, he’s have to live another 100 years to find the real answer to his paradox.

Read the full article →

Apollo 14: The Ultimate Sand Trap

Scotland may take credit for inventing the game, but leave it for a witty American to take the sport to its greatest heights – literally!

Read the full article →

The Greatest Images and Imaginations in Astronomy and Space Exploration

Io Erupting (Voyager 1)

We might have discovered this six years earlier if not for a glitch. Of the thousands of commands sent to Pioneer 10 during the 24 days of its Jupiter encounter, only one was lost due to those radiation belts. It could have been one just like this.

Read the full article →

Henrietta Swan Leavitt (1868-1921)

Unknown to all at the time, her discovery would forever change our understanding of the universe.

Read the full article →

The Greatest Images and Imaginations in Astronomy and Space Exploration

Chandra Finds Relativistic Pinball

The ACIS data suggests cosmic rays come not from the birth of atoms, as originally proposed by Robert Millikan, but from the death of stars.

Read the full article →