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Perseverance - the hunt for life on mars

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Hatchdog
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Re: Perseverance - the hunt for life on mars

Post by Hatchdog » Sat Feb 20, 2021 10:42 am

GunnyGene wrote:
Fri Feb 19, 2021 9:15 pm
CT_Shooter wrote:
Fri Feb 19, 2021 8:18 pm


Great range report, NASA.

Image
Indeed. Kinda like hitting a running hog at 2000yds from a helicopter doing 80mph. And you only get one shot. ;)

That certainly puts it all into prospective, great analogy.
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GunnyGene
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Re: Perseverance - the hunt for life on mars

Post by GunnyGene » Sat Feb 20, 2021 11:31 am

Hatchdog wrote:
Sat Feb 20, 2021 10:42 am
GunnyGene wrote:
Fri Feb 19, 2021 9:15 pm
CT_Shooter wrote:
Fri Feb 19, 2021 8:18 pm


Great range report, NASA.

Image
Indeed. Kinda like hitting a running hog at 2000yds from a helicopter doing 80mph. And you only get one shot. ;)

That certainly puts it all into prospective, great analogy.
It's orders of magnitude tougher than the hog shot, even if you can sort of adjust the trajectory on the way to Mars. You have to figure the speed of light, which means Mars is a little over 11 minutes ahead of where it appears to be in a telescope. Mars orbital velocity is approx. 24km/sec. So in that 11 min. Mars would have traveled approx. 16,000 km ( 9,900 miles). Same with communications to the rocket as it nears Mars. And Mars is only about 4,200 miles in dia. so you could miss the entire planet very easily. And none of that includes the rotation speed of the planet (868km/hr -- 539miles/hr), which also has to be taken into account if you're aiming for a specific spot on the surface. Lead time on that Martian hog is really out there. :shock:
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Re: Perseverance - the hunt for life on mars

Post by John E Davies » Sat Feb 20, 2021 2:09 pm

GunnyGene wrote:
Sat Feb 20, 2021 11:31 am
It's orders of magnitude tougher than the hog shot, even if you can sort of adjust the trajectory on the way to Mars. You have to figure the speed of light, which means Mars is a little over 11 minutes ahead of where it appears to be in a telescope. Mars orbital velocity is approx. 24km/sec. So in that 11 min. Mars would have traveled approx. 16,000 km ( 9,900 miles). Same with communications to the rocket as it nears Mars. And Mars is only about 4,200 miles in dia. so you could miss the entire planet very easily. And none of that includes the rotation speed of the planet (868km/hr -- 539miles/hr), which also has to be taken into account if you're aiming for a specific spot on the surface. Lead time on that Martian hog is really out there. :shock:
That is a great description, however it isn’t at all like a bullet from a rifle, because the shooters back on Earth can make course corrections en route using the thrusters. And on this landing, they wanted a really precise touchdown in a really hazardous location (200 foot cliffs just a mile away), so the lander used its camera/ radar system and made its own adjustments based on what it saw, during that final phase. That impresses me a lot more than the fact that computers at home can calculate trajectories so well. I noticed on the “dash display” that the skycrane had about 1000 pounds of fuel on board as it started down. I did not notice how much was left when the cables released.....

Interesting article about the “Right Kind of Crazy” Skycrane:

“The Skycrane works much like a heavy-lift helicopter (without the blades), using tether cables to lower the rover down to the surface while the crane relies on rocket propulsion to hover above. In fact, the team even consulted with the engineers and pilots behind the Sikorsky Skycrane, a helicopter that uses very similar technique to haul logs from forests, as well as other heavy cargo. But unlike earthly helicopters, as soon as the rover’s wheels hit Mars regolith, the flying crane shoots itself clear of the landing area, completing its task in a fiery explosion.”

https://astronomy.com/news/2021/02/sky ... nd-on-mars

John Davies
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GunnyGene
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Re: Perseverance - the hunt for life on mars

Post by GunnyGene » Sat Feb 20, 2021 3:04 pm

John E Davies wrote:
Sat Feb 20, 2021 2:09 pm
GunnyGene wrote:
Sat Feb 20, 2021 11:31 am
It's orders of magnitude tougher than the hog shot, even if you can sort of adjust the trajectory on the way to Mars. You have to figure the speed of light, which means Mars is a little over 11 minutes ahead of where it appears to be in a telescope. Mars orbital velocity is approx. 24km/sec. So in that 11 min. Mars would have traveled approx. 16,000 km ( 9,900 miles). Same with communications to the rocket as it nears Mars. And Mars is only about 4,200 miles in dia. so you could miss the entire planet very easily. And none of that includes the rotation speed of the planet (868km/hr -- 539miles/hr), which also has to be taken into account if you're aiming for a specific spot on the surface. Lead time on that Martian hog is really out there. :shock:
That is a great description, however it isn’t at all like a bullet from a rifle, because the shooters back on Earth can make course corrections en route using the thrusters. And on this landing, they wanted a really precise touchdown in a really hazardous location (200 foot cliffs just a mile away), so the lander used its camera/ radar system and made its own adjustments based on what it saw, during that final phase. That impresses me a lot more than the fact that computers at home can calculate trajectories so well. I noticed on the “dash display” that the skycrane had about 1000 pounds of fuel on board as it started down. I did not notice how much was left when the cables released.....

Interesting article about the “Right Kind of Crazy” Skycrane:

“The Skycrane works much like a heavy-lift helicopter (without the blades), using tether cables to lower the rover down to the surface while the crane relies on rocket propulsion to hover above. In fact, the team even consulted with the engineers and pilots behind the Sikorsky Skycrane, a helicopter that uses very similar technique to haul logs from forests, as well as other heavy cargo. But unlike earthly helicopters, as soon as the rover’s wheels hit Mars regolith, the flying crane shoots itself clear of the landing area, completing its task in a fiery explosion.”

https://astronomy.com/news/2021/02/sky ... nd-on-mars

John Davies
Spokane WA
Yeah, I know what I briefly described was very simplistic. There's a thousand other things that go into it. Available fuel for course corrections, gravity, & solar wind among them. It took the NASA team a few years to put this whole thing together, and there was still some uncertainty that it would go off as hoped. Phase 2 - retrieval of the samples by a separate spacecraft, lander, and launch back to Earth won't happen for 2 or 3 years. If that's successful, we might see a manned round trip a few years after that, which would present a multitude of other problems that would have to be solved to keep a crew alive for a couple years during the trip out and back. There ain't any truck stops along the way. ;)
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Re: Perseverance - the hunt for life on mars

Post by CT_Shooter » Tue Feb 23, 2021 9:08 pm

An Easter Egg on Mars... Fun with Science... 8-)
Chelsea Gohd wrote:During a news briefing on Monday (Feb. 22), NASA revealed the first video taken by Perseverance as it descended to and landed on the Martian surface Feb. 18. Those watching may have noticed a distinct red and white pattern on the interior of the parachute. Allen Chen, the entry, descent and landing lead for the mission confirmed in the briefing that there was a hidden message, and he dared the public to decode it.

"In addition to enabling incredible science, we hope our efforts in our engineering can inspire others," Chen said during the briefing. "Sometimes we leave messages in our work for others to find for that purpose, so we invite you all to give it a shot and show your work."

https://www.space.com/perseverance-rove ... age-solved
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MARCIA DUNN wrote:It took just a few hours for space fans to figure it out, Clark said. Next time, he noted, “I’ll have to be a little bit more creative.”

“Dare Mighty Things” — a line from President Theodore Roosevelt — is a mantra at JPL and adorns many of the center’s walls. The trick was “trying to come up with a way of encoding it but not making it too obvious,” Clark said.

As for the GPS coordinates, the spot is 10 feet (3 meters) from the entrance to JPL’s visitor center.

https://apnews.com/article/mars-rover-p ... 7d57ef564d
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Re: Perseverance - the hunt for life on mars

Post by fortyshooter » Wed Feb 24, 2021 8:00 pm

You think there are any UFO findings in the pictures,videos of all the Mars missions? If "they" are around the earth why not the other planets?
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