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Physics and astronomy thread (4 Viewers)

Galileo said:
I am not familiar with this specific tri pod, but from the page you linked...

ETA...I just re-read your post.  I guess your question is more about HOW to unlock, not the need to unlock.  Sorry.  I would think there might be a flip lever on the base somewhere...
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I agree with you there should be something to flip. I am probably staring right at it. My son couldn't figure it out either.

 
No screw opposite of fine adjustment. Where you see the triangular head I have a round knob. I think that is to use to make gross adjustments once I figure out how to unlock it. The shaft screws directly into the mount.

 
NASA JPL@NASAJPL

Flight 20 was a success! ✅ In its 130.3 seconds of flight, the #MarsHelicopter covered 391 meters at a speed of 4.4 meters per second, bringing it closer to @NASAPersevere's landing location.

 
El Floppo said:
NASA JPL@NASAJPL

Flight 20 was a success! ✅ In its 130.3 seconds of flight, the #MarsHelicopter covered 391 meters at a speed of 4.4 meters per second, bringing it closer to @NASAPersevere's landing location.
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:yawn:

ho-hum... flight 21 done on 3/11 

#MarsHelicopter can’t be stopped! Ingenuity successfully completed its 21st flight on the Red Planet. The small rotorcraft traveled 370 meters at a speed of 3.85 meters per second and stayed aloft for 129.2 seconds. http://go.nasa.gov/ingenuity

 
El Floppo said:
:yawn:

ho-hum... flight 21 done on 3/11 

#MarsHelicopter can’t be stopped! Ingenuity successfully completed its 21st flight on the Red Planet. The small rotorcraft traveled 370 meters at a speed of 3.85 meters per second and stayed aloft for 129.2 seconds. http://go.nasa.gov/ingenuity
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I was just coming here to post on 'Ginny.  Her mission got extended to September and even more challenging flights: https://techcrunch.com/2022/03/21/nasas-ingenuity-helicopter-will-keep-flying-on-mars-through-at-least-september/

 
El Floppo said:
:yawn:

ho-hum... flight 21 done on 3/11 

#MarsHelicopter can’t be stopped! Ingenuity successfully completed its 21st flight on the Red Planet. The small rotorcraft traveled 370 meters at a speed of 3.85 meters per second and stayed aloft for 129.2 seconds. http://go.nasa.gov/ingenuity
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they're doing so many, I skipped over 22 and 23.

It was up, up, and away last weekend for NASA's Ingenuity helicopter, which completed its 24th Martian flight on Sunday (April 3).

The sortie was just a short repositioning hop, covering 154 feet (47 meters) of ground in 69.5 seconds at a maximum altitude of 33 feet (10 m). But it was an important flight, helping reposition Ingenuity for its exit out of the Séítah region of Mars' Jezero Crater on its way to an ancient river delta, where the helicopter will work in tandem with NASA's life-hunting, sample-collecting Perseverance rover. 

Sunday's flight also marked the first time the helicopter took off at a different time of day — 9:30 a.m. local mean solar time (LMST), rather than the standard 10 a.m. LMST.
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If/when we get people to Mars- they'll be able to live-fly drones to do some amazing scouting, recon and science. but it's still insane to me that they can program Ginny to smart-fly itself from place to place on a planet 9 months away from us.

 
El Floppo said:
If/when we get people to Mars- they'll be able to live-fly drones to do some amazing scouting, recon and science. but it's still insane to me that they can program Ginny to smart-fly itself from place to place on a planet 9 months away from us.
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to the guys smarter than me here (ok... all of you)... would Ginny be able to translate to the Moon? Is the air density/gravity such that it would allow a drone copter like her? 

and I don't even know if we need it there- I assume the moon's surface has been pretty well documented by now. I just figured that with the Artemis program currently looking at 2025 for a landing, we're likely to have people back on the moon long before we have them on Mars. although Musk just might Musk something out of his ### before then.

 
El Floppo said:
to the guys smarter than me here (ok... all of you)... would Ginny be able to translate to the Moon? Is the air density/gravity such that it would allow a drone copter like her? 

and I don't even know if we need it there- I assume the moon's surface has been pretty well documented by now. I just figured that with the Artemis program currently looking at 2025 for a landing, we're likely to have people back on the moon long before we have them on Mars. although Musk just might Musk something out of his ### before then.
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Well, I won't claim to be smarter, but the moon's atmosphere is not much of anything to speak of.  On earth we have about 10^19 molecules per cubic centimeter near the surface.  Mars' atmosphere contains around 10^16...maybe a little closer to 10^17 molecules per cubic centimeter.  The moon has about 10^6 molecules in the same volume.  By earth/mars standards, it is virtually a vacuum.  I am no drone expert, but I would not think Ginny would fare to well in the moon's environment.

 
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Galileo said:
Well, I won't claim to be smarter, but the moon's atmosphere is not much of anything to speak of.  On earth we have about 10^19 molecules per cubic centimeter near the surface.  Mars' atmosphere contains around 10^16...maybe a little closer to 10^17 molecules per cubic centimeter.  The moon has about 10^6 molecules in the same volume.  By earth/mars standards, it is virtually a vacuum.  I am no drone expert, but I would not think Ginny would fare to well in the moon's environment.
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Exactly right.  No real atmosphere on the moon, therefore no ability to generate lift via air pressure differential on the wings/blades of a flying vehicle.  The only flying objects will be of the "kinetic" variety like a rocket or a catapult or a magnetic launch or something.  The nice thing is that with no atmosphere a maglev train would be suuuuuper fast, but flying would be not so good.  Much better on Venus, but the heat and humidity would suck there... 

 
The Z Machine said:
Much better on Venus, but the heat and humidity would suck there... 
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Venus has that slight challenge of hot sulfuric acid clouds that blanket the surface. 

I've been involved in designing a lander and it's not an easy environment.  Getting something to last for minutes there is a victory.

 
Sand said:
I've been involved in designing a lander and it's not an easy environment.  Getting something to last for minutes there is a victory.
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I read some crazy spit about making a 100% mechanical lander / rover for venus.  Like some sort of steampunk thing.  Sounds like a recipe for a waste of time and money. 

 
The Z Machine said:
I read some crazy spit about making a 100% mechanical lander / rover for venus.  Like some sort of steampunk thing.  Sounds like a recipe for a waste of time and money. 
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The one I worked on contained a gas reservoir to bathe the internals in inert gas to keep them from degrading and cool.  Even then the lifespan wasn't supposed to be very long.   Venus is a nasty environment.

 
Sand said:
The one I worked on contained a gas reservoir to bathe the internals in inert gas to keep them from degrading and cool.  Even then the lifespan wasn't supposed to be very long.   Venus is a nasty environment.
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Not sure how you'd keep them cool without a refrigeration cycle...  Honestly, it sounds like fun for the first 30 minutes of designing it, but after that like a royal PITA.

 
The Z Machine said:
Not sure how you'd keep them cool without a refrigeration cycle...  Honestly, it sounds like fun for the first 30 minutes of designing it, but after that like a royal PITA.
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My mind is stretching back - I think they were hoping for an hour.  It's like being in Dune and worrying about keeping cool in the desert, but knowing the worms are bound eat you momentarily anyway.  If I remember right the best anything has done previously is about 10 minutes.  I don't remember the details and that program never did get traction.  The concept was pretty sound and I hope it does come back at some point.

 
Sand said:
My mind is stretching back - I think they were hoping for an hour.  It's like being in Dune and worrying about keeping cool in the desert, but knowing the worms are bound eat you momentarily anyway.  If I remember right the best anything has done previously is about 10 minutes.  I don't remember the details and that program never did get traction.  The concept was pretty sound and I hope it does come back at some point.
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The USSR sent a number of probes to the surface of Venus (Venera program I think).  They were basically spherical shells that contained the instruments. Some even returned photos of the surface of the planet. 

They confirmed it's a hellscape.

 
Right now the most interesting thing we can do is study Jupiter's moons IMHO.

Obviously identifying potentially habitable planets is exciting too.

 
STEADYMOBBIN 22 said:
When will we get any significant pictures or information from the James Webb telescope? Sometime after Christmas?
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From the Webb Space Telescope site's quick facts page...

After reaching its orbit, Webb undergoes science and calibration testing. Then, regular science operations and images will begin to arrive, approximately six months after launch. However, it is normal to also take a series of "first light" images that may arrive slightly earlier.
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El Floppo said:
The sortie was just a short repositioning hop, covering 154 feet (47 meters) of ground in 69.5 seconds at a maximum altitude of 33 feet (10 m). But it was an important flight, helping reposition Ingenuity for its exit out of the Séítah region of Mars' Jezero Crater on its way to an ancient river delta, where the helicopter will work in tandem with NASA's life-hunting, sample-collecting Perseverance rover. 

Sunday's flight also marked the first time the helicopter took off at a different time of day — 9:30 a.m. local mean solar time (LMST), rather than the standard 10 a.m. LMST.
Expand  
Click to expand...


If/when we get people to Mars- they'll be able to live-fly drones to do some amazing scouting, recon and science. but it's still insane to me that they can program Ginny to smart-fly itself from place to place on a planet 9 months away from us
Click to expand...
Flight 25 done.

 
Webb Telescope almost fully aligned

The Webb Space Telescope is in its final (seventh) stage of alignment, bringing the superlative spacecraft tantalizingly close to commencing its scientific operations.

This alignment stage involves final tweaks to the telescope’s primary mirrors and is happening right on schedule, four months after the spacecraft’s launch from French Guiana. Unlike the earlier alignment stages, each of which had a specifically outlined goal—stacking images of a specific star, for example—the seventh (and final) stage merely repeats certain checks made previously, to ensure everything is as precise as possible.

Meanwhile, the crucial Mid-Infrared Instrument (MIRI) aboard Webb has achieved its final, bone-chilling temperature, according to a NASA release published earlier this month. Since Webb will observe objects like planets, comets, asteroids, and protoplanetary discs in the mid-infrared wavelengths, it’s vital that MIRI—the coldest instrument aboard Webb—is functioning properly. That means chilling it to the point that the vibrations of the atoms inside Webb’s detectors are suppressed. Those vibrations (called “dark current”) go up by a factor of 10 for every degree the instrument temperature increases, according to NASA.

Webb’s 18 mirrors also have to be cooled. The telescope’s primary mirror segments and its secondary mirror are made of beryllium, which takes a long time to cool down.

“Since all the mirror temperatures are now below 55 kelvins, it is expected that MIRI will be sensitive enough to perform its planned science, but any additional cooling of these mirrors will only enhance its performance,” wrote Jonathan Gardner, a Webb deputy senior project scientist, in a NASA blog. “The Webb team hopes to see the mirrors cool by an additional 0.5 to 2 kelvins.”

Later in the telescope’s commissioning, the Webb team will also test how much the spacecraft heats up and cools down depending on the angle it’s at relative to the Sun. That process will help the team correct for those temperature changes during scientific observations, which are expected to begin this summer.

More: How the Webb Space Telescope Will Support the Search for Alien Life
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The European Southern Observatory is planning a global press conference to announce "groundbreaking Milky Way results" on May 12th.  The results are coming from the Event Horizon Telescope project which brought us the first images of a black hole (center of the M87 galaxy) a couple years ago.  Perhaps they have imaged Sagittarius A at the center of the Milky Way???

 https://eventhorizontelescope.org/blog/event-horizon-telescope-collaboration-announce-groundbreaking-milky-way-results-may-12th

 
Galileo said:
The European Southern Observatory is planning a global press conference to announce "groundbreaking Milky Way results" on May 12th.  The results are coming from the Event Horizon Telescope project which brought us the first images of a black hole (center of the M87 galaxy) a couple years ago.  Perhaps they have imaged Sagittarius A at the center of the Milky Way???

 https://eventhorizontelescope.org/blog/event-horizon-telescope-collaboration-announce-groundbreaking-milky-way-results-may-12th
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Detailed shots of craters on Uranus.

 
Andy Dufresne said:
Is that really even possible? Optically I mean. Seems like there's no way that perspective works.
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I was going to use the "shopped" gag... because it honestly looks shopped. 

but what aspect of the perspective do you have an issue with? that we could see Saturn from Earth lined up with the moon? 

reading the comments- the people who come across as most reasonable are the ones defending it as probably real. :shrug:  no idea.

 
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