Relative rotation speed and axial tilts of the planets.

Credit: Dr James O'Donoghue

A universe in motion seen from the International Space Station during a night pass over Earth (view fullscreen).

The unusual behavior of a handle spinning in space, suddenly reversing its orientation, a striking example of the tennis racket theorem (also called the Dzhanibekov effect).

Credit: NASA

Happy 18th birthday ggplot2! #rstats

NEW 🧵

A quick thread of charts showing how Trump’s economic agenda is going so far:

1) US consumers are reacting very very negatively.

These are the worst ratings for any US government’s economic policy since records began.

One Headlight.

Shooting the Milky Way and having composed this image, a vehicle emerged from the fog-laden valley below. Initially annoyed, I was to delete this file. But this image has become my favourite from that night's shoot.

Take-away, don't delete files in camera.
#photography #milkyway

Construction of the Eiffel Tower from 1887-1889.

Time-lapse of the Sun circling the horizon at the South Pole during early March.

Video credit: Robert Schwarz
Source: vimeo.com/208466944

The #core of the #Earth spins around a slightly different axis compared to the #mantle. In this animation we start in a space frame and switch gradually to the frame spinning with the mantle. In that frame the core appears to wobble. The mantle precesses and the core, being fluid, lags a bit. 🧪 🔭

This is what Earth looks like from 1.5 billion kilometers away. A pale blue dot beneath the rings of Saturn captured by the Cassini spacecraft.

Credit: NASA/JPL-Caltech/SSI

A stunning time-lapse of Earth setting below the Moon's horizon captured by the Japanese spacecraft Kaguya as it orbits the Moon.

Credit: JAXA/NHK