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kottke.org posts about James O’Donoghue

The Relative Rotations of the Planets

posted by Jason Kottke   Dec 11, 2019

Planetary scientist James O’Donoghue made this cool little visualization of the rotation speeds of the planets of the solar system. You can see Jupiter making one full rotation every ~10 hours, Earth & Mars about every 24 hours, and Venus rotating once every 243 days. He also did a version where all the planets rotate the same way (Venus & Uranus actually rotate the other way).

See also O’Donoghue’s visualizations of the speed of light that I posted back in January.

Visualizing the Speed of Light

posted by Jason Kottke   Jan 24, 2019

Light is fast! In a recent series of animations, planetary scientist James O’Donoghue demonstrates just how fast light is…and also how far away even our closest celestial neighbors are. Light, moving at 186,000 mi/sec, can circle the Earth 7.5 times per second and here’s what that looks like:

It can also travel from the surface of the Earth to the surface of the Moon in ~1.3 seconds, like so:

That seems both really fast and not that fast somehow. Now check out light traveling the 34 million miles to Mars in a pokey 3 minutes:

And Mars is close! If O’Donoghue made a real-time animation of light traveling to Pluto, the video would last over 5 hours. The animation for the closest undisputed galaxy, Seque 1, would last 75,000 years and 2.5 million years for the Andromeda galaxy animation. The farthest-known objects from Earth are more than 13 billion light years away. Light is slow!

See also The Leisurely Pace of Light Speed.