What is the Dark Side of the Moon?



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Q: What is the "dark side" of the moon?

A: The short answer? There is a misnomer. A cool-sounding misnomer! But a misnomer. Assuming they aren't talking about the Pink Fluid Album or the French Mocumentary, people who say "the dark side of the moon" are almost always referring to the moon father Side-by-side, despite pointing away permanently from those of us planets, actually sees as much sunshine as the side facing Earth.

Maybe you already knew that. However! Did you also know that the elite of the far-flung elephants are constantly sleeping in mind? Or that certain lunar regions are, in fact, shrouded in permanent darkness?

To understand why, you first need to understand why one side of the moon has always been away from the earth. To those of us here on earth, our planet's natural satellite itself to never turn. But it's actually all the time – it just spins on its axis and loops around our planet at the same time: once every 27 days or so. When a cosmic body revolves around its father and its axis at the same time, astronomers say it is "secretly locked."

Our moon was not born this way. Astronomers think that, like many natural satellites, their lives began to spin at a very different rate. (In the case of our moon, astronomers think it once faster about its axis.) But over time, gravity of our planet exerted balm torque in the lunar surface, forcing its rotation into synchronization with its orbital period. This phenomenon is actually quite common: many Saturn and Jupiter's moons are temporarily locked in with their parent planet.

Tidal locking is why we had no idea the far side of the moon looked like until 1959, when the Soviet space probe Luna 3 snapped the first photos of the Crater-Lazy landscape. We've got some good looks since: in 1968, astronauts aboard the NASA's Apollo 8 mission became the first people to look at the moon's far side with their own eyes. NASA's Lunar Reconnaissance Orbiter has been mapping the entire high-resolution lunar surface since 2009. And in the first few days of 2019, China was the first country to perform a soft spacecraft landing and deploy a rover on the moon. & # 39; s forever hidden persons. China's Chang 4th Lander and Jade Rabbit 2 Rover will give humanity its first close look at that distant Lunar landscape.

But the truth is, you don't need a spacecraft to look at the far side of the moon. While you can only see a maximum of 50 percent of the lunar disc at any given time, bonus smudges from its surface are constantly revealing themselves to careful observers. In fact, over a longer cycle, up to 59 percent of the surface of the moon, visible on earth, assumes they know what to look for.

Check out this footage from NASA's Science Visualization Studio. It was made using satellite imagery captured by the Agency's Lunar Recovery orbiters. The Face Changes You're Not A Much Familiar With: As the moon's position shifts relative to the sun and the earth, darkness envelopes and recedes from the face of the planet's secretly locked-in planet (while back and forth, leaving off the face) . But this animation that condenses two and a half lunar cycles into a single 13-point Gif illustrate something about the moon you couldn't have noticed before: the moon kind of … Vobbles.

Astronomers call the Vobbles libraries, and they are caused by the moon's orientation and the elliptical shape of its orbit. The tilt of its axis relative to Earth makes the moon appear as though it is the planet's slow and gentle gnawing, sacrificing observers fleeting glimpses of its northern and southern poles. The indifference of the moon's legend lends its face to a small root, which enables those of us on Earth to appear on its eastern and western shores, as it swings back and forth, unlike the party parrot: in slack . (The irregular orbit also explains the reader's apparent changes in size due to the distance from the ground.)

And the moon's tilt from the moon is yet another interesting phenomenon: patches of the lunar surface that really are, truly, perpetually dark:

NASA / GSFC / Arizona State University

The image above is an illumination map of the moon's south pole. There has been a composite image of more than 1,700 photographs captured by the Lunar Recovery Awareness over a six-month period. Regions of the pole that saw no light in that time appear black; Those who saw continuous light appear white; The gray regions saw something in between. As a point of reminder, the black circle near the center of the image is the Shaklton Crater, an impact crater 13 miles across with a rim that casts a long, perpetual shadow on its interior.

All that is to say: "The dark side of the moon" cannot technically exist, but "craters of eternal darkness" – which closes even cooler-definitely.


Robbie Gonzalez is a senior writer for Wire's Science Desk. His fascination with the moon dates back to his childhood, when, at the age of 4, he first gimped it through a telescope. (He still owns that telescope.)

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