Crazy Engineering: GRACE-FO
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- เผยแพร่เมื่อ 6 พ.ค. 2018
- Crazy Engineering sees double! Twin satellites that will track water movement on Earth and test a new laser measurement technology. For more about the mission, visit gracefo.jpl.nasa.gov
- วิทยาศาสตร์และเทคโนโลยี
"We have lasers" hahahaha awesome mission
This is incredible!!! Im so excited to learn more! Thank you!
Very useful data with Grace. Keep watching the most important planet NASA.
They didn't actually say why lasers are better however I gather that because the laser light has a smaller wavelength it means that the phase shifting between the outgoing and returning signal can be measured with smaller increments?
Ten times more accurate distance, but more interestingly, they will get relative pitch and yaw data (if it works) because there are multiple lasers.
Character In the video It's great, I like it a lot $$
In the background ...it’s about lasers and wave lengths .
He said the instruments can measure within a micron. By how much can the Earth affect the distance between the satellites?
Will the data from GRACE-FO be at a level of precision that it can be correlated with the LIGO data to trilaterate events in post-process?
LIGO is insanely precise, subatomic level. The laser precision on GRACE-FO is impressive, but not nearly enough to detect gravity waves.
Why would you not include the improvement in measurement accuracy...?
Are there any perturbances (besides gravity) in the satelite movement to deal with?
probably atmospheric drag and solar radiation pressure
crazy!
nice vid, but you left out the hole point of the experiment. to track changes of water around the Earth.
很棒的科技 更能掌握地球的千變萬化
This is such an interesting phenomenon! I thought that Newton's law of universal gravitation tells us that the farther away from earth you go the less gravity is. That would mean that the same person standing on Mt. Everest would weigh less than they would at sea level. But I never thought about the density at various locations on earth! According to this video, the person would weigh more on Everest since they are standing on a solid chunk of rock.
The video was talking about the acceleration at a single elevation (that of the satellite) as it moves around the Earth. As you said, local gravity on top of a mountain is reduced by increased distance to the center of the Earth, and also by increased centripetal effect from the Earth's rotation. The nearby dense rock offsets those reductions so you weigh more than someone in an aircraft at the same elevation, but less than you would at sea level.
So there's less gravity in San Diego than Hawaii?
Very informative. But I doubt putting in a buff dude and playing some rock music in the back is enough to sway children.
By looking at a boat disappear from bottom to top, if the Earth was flat, this would be impossible.
Buff dudes are enough to me. 😉
then you need to lay off the drugs and read a science textbook
Typical flattard reponse, the thing is that you pancakes think the Earth is as small as an Island.
First of all the Globe Earth isn't hypothetical and has been proven with photographic proof. Secondly you measure light years away by the amount of time it take for light to reach that certain place. Thirdly Flat Earth is a disproven, completely idiotic belief which was disproven over 100 years ago.
then why is air not more dense at the highest mountain tops where gravity is the strongest? shouldn't air travel up not down to seek the most attraction to the force?
I believe air density = the amount of air above you pressing down x weight of air. Yes, higher gravity makes the air heavier, but, since you're so far up there is less air above you resulting in a net decrease of air density.
Gravitational force vector is down, roughly toward the center of Earth, not toward regions where the gravitational force magnitude is strongest.
Local gravity is weaker on top of a mountain than it is at sea level. That's because of the greater distance to the center of the Earth and also a larger centripetal effect from Earth's rotation. There might be a tiny tendency for air to collect at the base of a mountain since the mountain is pulling air toward it.
If the Earth was a perfect sphere, then the satellites flying around the Earth in a circular orbit would always be accelerating toward the center of the circle, but when passing near a mountain, that acceleration vector shifts very slightly toward the center of the mountain due to the pull of the entire mountain's gravity. That small change is detectable with computer analysis and was what the video was referring to.
Taking Space X's rocket, hmm?
You'll note that since he's an actual scientist, he said "1/10th the size of a human hair."
What he didn't say was "ten times smaller than a human hair." Why? Because no math will give you more than 1x less of something in the real world. Something you can hold in your hand.
When people say 10 times smaller, they mean a division by 10 or a multiplcation of 1/10, i.e. 1 micron, ten times is aproximately the width of a human hair.
I support you could also say "One tenth times the width of a human hair" and while it would be technically correct, it would be far more natural to say "Ten times smaller than the width of a human hair"
The engineering turned me on, the crazy turned me off. Way too hyper.
Is he indian
Maybe you could use those lasers to measure the curve of the earth?
*hmmm...🤔 Thanks Captain Obvious!😹*
wrong. they do not know about gravity. just effect of it. Engineers are doing fine. what I want to know when the scientist going to understand gravity. current understanding is effect of gravity which no more than animal and vegetable. I expected more from man. MG1
einstein explained what gravity is, :)
Angor de Prinzmetal, Einstein was a clever man. He made a soup out of accepted science of his day and presented it as gravity to scientist. Max Planck objected to his work, he was ordered to co-operate with him like others while he is in Germany. My grandfather told him he is wrong before he left Germany. He wanted to know correct version. Grandfather refused for obvious reasons, but advised him to study bicycle. Einstein spent rest of his life to understand gravity with no success. truthful scientist would tell that all space missions are based on Newton not Einstein. For political reasons over 110 years wasted by scientist chasing their tails without understand gravity. Just effect of it like animal and vegetables. MG1
>all space missions are based on Newton not Einstein
Then why does GPS make use of special and general relativity in their geolocation equations?