Russia's Luna 25 to the lunar south pole scheduled to take place on August 10.
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- Thread starter bd popeye
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Raptor's thrust to be increased by 20% in the new version
Does anyone have any information of the upgrades of the lander of Chandrayaan 3 from Chandrayaan 2? So far what I know is that they removed the 5th center placed fixed thrust engine. Is there any upgrade of the other 4 engines? Especially their capability of throttle ratio?
SteelBird
Colonel
So far as I know, the Chandrayaan3 took off on July 14 but the soft landing is planned for Aug 23 or 24. Further, the mission life is one moon day or 14 earth days. It makes me wonder;
1. How come the mission is so short lived? India spent billions of dollars for staying on the moon for just two weeks?
2. The distance between earth and moon is roughly 384K+ km and speed of space rocket is roughly 40K km/h. This means a rocket could arrive at the moon atmosphere in roughly 10 hours. Why it takes longer than one month to land on the moon?
1. How come the mission is so short lived? India spent billions of dollars for staying on the moon for just two weeks?
2. The distance between earth and moon is roughly 384K+ km and speed of space rocket is roughly 40K km/h. This means a rocket could arrive at the moon atmosphere in roughly 10 hours. Why it takes longer than one month to land on the moon?
1. India has spent "billions" on this specific campaign.
2. You can view an animation about the mission profile here: , and a mission brochure . It should answer your question.
1. Two weeks on the moon.
Two explanations.
• First all nations want to demonstrate to the world their Post Boost Vehicle (PBV) capabilities. This of course means they have entered the elite club of great powers possessing ICBM tipped with MIRV.
By targeting instead the moon, this trick will allow the respective governments to thwart any condemnation from the UNSC. This is why Israel, India, Iran, North Korea, Turkye, South Korea are all in the race with declared goal to send an indigenous impactor under the guise of 'lander' that have near zero chance to survive the landing.
Notice that Israel next lunar mission will include two impactors demonstrating a MIRV strike capabilities and disguised as 'landers'. This following the previous successful 'landing failure' of Beresheet-1 mission.
▲ Beresheet-2 mission with 2 'landers'.
• How can a probe survive the freezing subzero temperature of the lunar night?
Chang'e 3 remains inactive and is heated by a RTG (Radioisotope Thermoelectric Generator) using the thermal energy released by a radioactive material and converting it into electrical energy.
Yutu rover operates throughout the two weeks of lunar day and charges its battery to survive the long lunar night. Its mass is therefore 140 kg or ~6 times heavier than the clumsy Pragyan rover.
The ridiculous 26 kg Pragyan 1 and 2 rovers are obviously not intended to do any serious job.
Chandrayaan-2 and Chandrayaan-3 are not heated by a RTG.
Note that because the Chinese Martian rover Zhurong does not carry a Radioisotope Thermoelectric Generator, it can not produce electricity outside of it solar panels, thus sealing its fate.
2. $75 million (₹ 6.1 billion). That is the total cost of the Chandrayaan-3 project according to an early estimate provided by ISRO in 2020
3. Why it takes longer than one month to land on the moon? Simply because it follows the rule dictated by orbital mechanics. It doesn't follow a linear path called geodesic like a beam of light, but an elliptic or hyperbolic orbit. This to minimize the rocket.
It is going to take a couple of orbit raising around the earth, so that the space craft can be swung towards the moon.
