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October 24, 2021 Archives

Sunday, October 24, 2021

TRACKING WITH CLOSEUPS: Blue Field Entoptic Phenomenon—Seeing Blood Cells in the Retina

The really remarkable thing about the blue field entoptic phenomenon isn't that you can see the red blood cells moving, but that you don't see the blood vessels and blood in front of the retina all the time. This is the brain up to its old trick of “editing out” distracting information.

Posted at 14:38 Permalink

CONTINUITY: ARM1 from 1985 vs. Apple M1 Max

Here is more about the evolution of the ARM processor architecture over the years.

Posted at 12:38 Permalink

CONTEXT: Earth and Moon from the Lunar South Pole

This computer-generated animation shows the Earth and Moon as viewed from the rim of Shackleton crater near the Moon's south pole, with the camera aimed at the mean position of the Earth. The Sun circles the horizon once a month, never more than 1.5 degrees above or below the horizon. The Earth bobs around its mean position with the lunar librations due to the eccentricity and inclination of the Moon's orbit. Shackleton crater is deep, 4.2 km, and in perpetual shadow. It is believed that water and other volatiles may have collected there.

Posted at 11:58 Permalink

THE HAPPENING WORLD: Weekly Space Report: Starship Static Fires, Catcher Arms Installed on Tower, NASA SLS Stacking Complete

Posted at 11:10 Permalink