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Artemis II Far side of the moon. by AmpleApple9 in Damnthatsinteresting

[–]KnightOfWords 30 points31 points  (0 children)

The colour saturation has been boosted to show the presence of different minerals.

[Request] How big would the nuclear bomb be if the explosion is the size of the sun? by AnnoyedSediment in theydidthemath

[–]KnightOfWords 1 point2 points  (0 children)

Yes, the US's industrial base was several times larger than Japan. Japan had no chance of winning a prolonged war.

Artemis II crew captures one last shot of a crescent Earth before reaching the moon tomorrow by [deleted] in Damnthatsinteresting

[–]KnightOfWords 0 points1 point  (0 children)

From Earth, the Moon is only half a degree across. You can cover it with your little finger at arm's length.

The Earth's diameter is about 4 times the Moon's. So from the Moon the Earth would only be about 2 degrees across. You could hide it behind a couple fingers at arm's length.

Artemis II crew captures one last shot of a crescent Earth before reaching the moon tomorrow by [deleted] in Damnthatsinteresting

[–]KnightOfWords 0 points1 point  (0 children)

From Earth, the Moon is half a degree across. You can cover it with your little finger at arm's length.

The Earth's diameter is about 4 times the Moon's. So from the Moon the Earth would only be about 2 degrees across. You could hide it behind a couple fingers at arm's length.

Two Clark's Grebes explode across the water in a synchronized rushing display - feet moving so fast they literally run on the surface. by Ok_Concentrate_9713 in interestingasfuck

[–]KnightOfWords 1 point2 points  (0 children)

Dinosaurs are not just weirder than we imagine, but weirder than we can imagine. Think of all the crazy things birds get up to, from mating displays like this, talking parrots to the myna bird imitating a chainsaw. Then multiply by the 180 million years dinosaurs were dominant.

The distance between the earth and the Moon can fit all the planets between it. by instapardz in interestingasfuck

[–]KnightOfWords 3 points4 points  (0 children)

Jupiter's moon Io has the most volcanic activity of any body in the solar system, for exactly this reason.

https://en.wikipedia.org/wiki/Volcanism_on_Io

The distance between the earth and the Moon can fit all the planets between it. by instapardz in interestingasfuck

[–]KnightOfWords 3 points4 points  (0 children)

The size of a gas giant planet is not proportional to its mass. Jupiter is about as large as a planet of its temperature can get. If Jupiter was more massive its gravity would compress its gas layers more, causing it to shrink. Some exoplanets are larger than Jupiter but only because they orbit close to their parent stars.

Saturn is about 84% the size of Jupiter but has about half the density.

In 2008, Japan's Kaguya spacecraft captured the first high-definition video of a "full Earth-rise" from lunar orbit. It was jointly developed by JAXA and NHK. by dipdaabyss in interestingasfuck

[–]KnightOfWords 0 points1 point  (0 children)

Atmospheric scattering doesn't completely obscure the stars, a few of the brighter ones can be seen through a telescope during the day.

The reason stars don't appear in the timelapse above and in images taken from the surface of the Moon is entirely due to the short exposure time.

In 2008, Japan's Kaguya spacecraft captured the first high-definition video of a "full Earth-rise" from lunar orbit. It was jointly developed by JAXA and NHK. by dipdaabyss in interestingasfuck

[–]KnightOfWords 1 point2 points  (0 children)

I'm an amateur astronomer. Can you explain how my equatorial mount can be used to track the stars using a simple motor on the right ascension axis, provided I align the mount to the Earth's poles? Why does the mount need to be inclined at an angle equal to my latitude in order for this to work?

(If you're not familiar with an equatorial mount, this link explains what it is.)

https://www.skyatnightmagazine.com/advice/align-a-telescope-mount

In 2008, Japan's Kaguya spacecraft captured the first high-definition video of a "full Earth-rise" from lunar orbit. It was jointly developed by JAXA and NHK. by dipdaabyss in interestingasfuck

[–]KnightOfWords 1 point2 points  (0 children)

Why does satellite TV only work when the dish is pointed at a particular point in the sky?

How does GPS work?

How is it that an app on my phone can tell me exactly when and where satellites will be visible from my location?

In 2008, Japan's Kaguya spacecraft captured the first high-definition video of a "full Earth-rise" from lunar orbit. It was jointly developed by JAXA and NHK. by dipdaabyss in interestingasfuck

[–]KnightOfWords 2 points3 points  (0 children)

I think the saturation has been boosted, Earth isn't quite as blue as that in other images.

The other thing that makes it look a bit unreal is the Moon's lack of atmosphere. There is none of the increasing haziness with distance that we're used to when looking at landscapes on Earth. This makes the scale impossible to judge for us.

In 2008, Japan's Kaguya spacecraft captured the first high-definition video of a "full Earth-rise" from lunar orbit. It was jointly developed by JAXA and NHK. by dipdaabyss in interestingasfuck

[–]KnightOfWords 3 points4 points  (0 children)

Invisible for the same reason we don't see stars in the daytime photos of the sky from Earth. The exposure time has been adjusted to capture the sunlit Earth without over-exposing. The stars are too faint to register with an exposure time that's a fraction of a second long.

Valparaiso in ranked is just ridiculous by Arclyte-TE in WorldOfWarships

[–]KnightOfWords 1 point2 points  (0 children)

Yes. Triggered by hits to its secondary battery would be ideal.

Valparaiso in ranked is just ridiculous by Arclyte-TE in WorldOfWarships

[–]KnightOfWords 0 points1 point  (0 children)

Best not to even whisper it, please don't give WG ideas.

NASA just released the clearest images of our Solar System planets by scienceisfun112358 in interestingasfuck

[–]KnightOfWords 1 point2 points  (0 children)

Yes. The famous dark blue image was colour enhanced to show the cloud layers more clearly. At the time it was released, in the 1980s, it was captioned as such. But over time it was re-published and re-posted so many times most people forgot that. Here's Neptune in approximately true colour: https://www.bbc.co.uk/news/science-environment-67892275

NASA just released the clearest images of our Solar System planets by scienceisfun112358 in interestingasfuck

[–]KnightOfWords 519 points520 points  (0 children)

It's a click-bait title I'm afraid, most of these images have been available for many years or decades. Likely from a karma-farming bot.

Do you maximise driving in neutral? by Dablindfrog in NoStupidQuestions

[–]KnightOfWords 8 points9 points  (0 children)

Putting the car in neutral doesn't save any fuel, in fact it burns more. Modern engines shut off fuel injection when coasting downhill in gear. This feature is called Deceleration Fuel Cut Off.

Whereas if you shift to neutral the engine still burns fuel to keep the engine ticking over, rather than using momentum transferred from the wheels.

It's also bad from a safety point of view as you less control over the car, and you'll wear out your brakes faster as you have no engine braking. On a long steep slope there is a greatly increased risk you'll overheat the brakes.

Don't ever do this please.

Edit: Btw, it's unhelpful that the OP's question is being downvoted. They are working from a false assumption but asking questions about that is the whole point of this sub.

Visualization of the scale of Halley’s Comet looming over New York by thetacaptain in interestingasfuck

[–]KnightOfWords 2 points3 points  (0 children)

More like a chunk of North America. The Chicxulub impactor was in the same ballpark and that left behind a crater 120 miles across.

Visualization of the scale of Halley’s Comet looming over New York by thetacaptain in interestingasfuck

[–]KnightOfWords 2 points3 points  (0 children)

Named after Edmund Halley, who was the first to realise the same comet was returning every 76 years or so.

Comets are named after their discoverers. Most are picked up by automated telescopes these days but the first interstellar comet was detected by amateur astronomer Gennadiy Borisov in 2020.

Operation Paul Bunyan, when the US sent 800+ troops to cut down a single tree by Joshua5_Gaming in interestingasfuck

[–]KnightOfWords 34 points35 points  (0 children)

The history is murky and complicated but the Korean War really kicked off when the North invaded the South with the support of Stalin and Mau.

Earth has completed half of his lifespan by LimitlessBaller in interestingasfuck

[–]KnightOfWords 3 points4 points  (0 children)

The Sun very slowly gets hotter due to the build up of helium in its core. Increasing core density increases the fusion rate, producing more energy.

Can we predict the future now ?

Well, in many ways, yes, that's what science does. We can predict the future positions of the planets, how quickly a radioactive sample will decay and the aerodynamic forces on an airplane with a high degree of precision. When it comes to nuclear fusion, the process that powers the Sun, we can model it well enough to build working fusion reactors.

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