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This is what the Night Sky on Mars looks like!

56,915 Aufrufe • vor 1 Jahr •via X (Twitter)

11 Kommentare

Profilbild von Michael McNeil
Michael McNeilvor 1 Jahr

Fakety, fake, fake. Why? Because Mars' atmosphere—though thin, only about 1% as thick as earth's—is still thick enough to support (a lot of) dust hanging around in air; nor is there ever precipitation (rain), which on earth can thoroughly clear the air of lingering dust and haze. Beyond just locally blown-up dust, there are larger scale and even planetary-wide dust storms on Mars which can raise the aerial density of suspended dust to extreme levels, sometimes for months at a time. To quantify this phenomenon, there's the concept of “optical depth”—a measure of the amount of optical scattering occurring due to particulates in the air. Really clear skies on earth have an optical depth of about 0.1. On Mars, during a dust storm, the optical depth can exceed 5.0. But even after such dust storm(s) technically come to an end, the residual level of dust lingering in the martian air typically continues in the range of 0.5-1.0—corresponding to severe urban air pollution, drifting/falling volcanic ash, or considerable smoke from wildfires, on earth. Thus, during the day on Mars—in footage taken by, e.g., the Curiosity rover (in Gale Crater) or Perseverance rover (which recently departed Jezero Crater)—those (several km or miles distant) crater walls are nearly always, to a great extent, hazed almost out of visibility by ambient dust in between in the air. In other words, what the “seeing” has been like recently in the American Midwest and Northeast (at night) due to rampaging, distant Canadian wildfires, is about what the night sky would look like—during relatively _good_ viewing conditions—on Mars, most or all the time (that seeing is good—it can get worse, a lot worse). It's sad that so many purportedly science- and astronomy-oriented pages on X (and likely elsewhere) have fallen for this false presentation. ____ pics: Two views of normal (non dust storm) conditions on Mars: 1) Curiosity rover's view of the floor and crater wall of Gale Crater on Mars, from the slopes of Aeolis Mons (a.k.a. Mt. Sharp); notice Gale crater wall barely visible in the distance through the haze. 2) A recent Nasa posting providing a time-exposure photograph of the martian night sky—as taken by the Perseverance rover, showing the moon Deimos and (only) 2 stars—all that are visible under Mars' (non dust storm) normal dusty conditions.

Profilbild von Rock Paper Sizzle
Rock Paper Sizzlevor 2 Jahren

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Profilbild von Preston Murray
Preston Murrayvor 1 Jahr

Fake

Profilbild von 🐉 SAJIB JEWEL
🐉 SAJIB JEWELvor 1 Jahr

Our Mother Earth is far better than any other planets.

Profilbild von Ibrahim Muhammad_AbouKhalil
Ibrahim Muhammad_AbouKhalilvor 1 Jahr

We will be there soon

Profilbild von The Lord Knight
The Lord Knightvor 1 Jahr

@grok - is this a real video ?

Profilbild von Cecilia Walton
Cecilia Waltonvor 1 Jahr

🤩

Profilbild von Jerry Runyan
Jerry Runyanvor 1 Jahr

Cool

Profilbild von Kalen
Kalenvor 1 Jahr

Zero light pollution

Profilbild von 𝕰𝖒𝖎𝖗𝖆𝖙𝖊 𝖔𝖋 𝕮𝖔𝖗𝖉𝖔𝖇𝖆
𝕰𝖒𝖎𝖗𝖆𝖙𝖊 𝖔𝖋 𝕮𝖔𝖗𝖉𝖔𝖇𝖆vor 1 Jahr

Yaaaaaa Allahhhh

Profilbild von Angee 🎗️
Angee 🎗️vor 1 Jahr

Truly amazing!

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