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  1. #2751
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    Quote Originally Posted by Takeovers View Post
    If anybody likes big bangs, this test is planned to go to destruction.
    In a way this was disappointing. It failed but the failing was very benign, just huge clouds caused by cold nitrogen through a miniscule leak. The tank is being fixed and outfitted with more sensors. It will be tested again soon.

    A YouTube video of the SpaceX history from humble and failing beginnings up to the recent and ongoing manned flight to the ISS.

    "don't attribute to malice what can be adequately explained by incompetence"

  2. #2752
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    Quote Originally Posted by Takeovers View Post
    In a way this was disappointing. It failed but the failing was very benign, just huge clouds caused by cold nitrogen through a miniscule leak. The tank is being fixed and outfitted with more sensors. It will be tested again soon.
    The tank was fixed and was used for another test. This time Elon delivered on the promise of test to failure. The tank was filled only with liquid nitrogen, not dangerous propellant. Still the event was energetic enough for the tank to drag the very massive steel stand along for a bit.




    Space News thread-starship-test-tank-sn7-failure-062320-a

  3. #2753
    Thailand Expat harrybarracuda's Avatar
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    AN hour long timelapse video of the Sun for the last ten years.

    If you watch carefully at 12:24 you can see Venus fly past it.


  4. #2754
    Thailand Expat harrybarracuda's Avatar
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    Alternatively you can watch a drive across the moon...


  5. #2755
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    NASA is doing some planning for a Venus mission. A Venus rover which operates purely mechanical, handling a wide variety of obstacles on the surface. Venus is extremely hot and conventional electronics would be fried immediately.




    But even if the rover mostly operates mechanically, it needs some electronics. Sensors and the ability to transmit data. A well insulated electronics core coud do that for a short while with cold materials to keep the temperature down.

    However NASA is also working on a new type of semiconductors that can operate on Venus. Not high capability compared to what we have on Earth but the bare minimum to make a Venus rover useful.

  6. #2756
    Thailand Expat OhOh's Avatar
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    Rocket to lift Mars probe moved to launch pad

    By Zhao Lei | chinadaily.com.cn | Updated: 2020-07-17 10:19

    "The Long March 5 heavy-lift carrier rocket to lift China's Tianwen 1 Mars probe was moved to its launch pad at the Wenchang Space Launch Center in Hainan province on Friday morning, according to the China National Space Administration. The administration said in a statement that the rocket was moved out of its testing complex at around 8 am and spent nearly two hours on the tracks toward the launch pad.

    It will blast off in due course between late July and early August to transport Tianwen 1, or Quest for Heavenly Truth 1, to an Earth-Mars transfer trajectory, the statement noted.

    The Chinese probe consists of three parts – the orbiter, the lander and the rover – and they will separate in Mars' orbit. The orbiter will stay in the orbit for scientific operations and signal relay while the lander-rover combination will make an autonomous descent and landing.

    The rover, which is expected to become the world's seventh of its kind and the first from Asia, has six wheels and four solar panels and carries six scientific instruments. It is more than 200 kilograms in weight and will work about three months on the planet, designers said."


    The launch rocket:
    Space News thread-5f11502aa3108348fcde2ec8-jpeg


    Space News thread-5f11502aa3108348fcde2eca-jpeg


    Space News thread-5f11502aa3108348fcde2ed8-jpeg


    The the lander and the rover:

    Space News thread-5f11502aa3108348fcde2edb-jpeg


    Fingers crossed for a successful launch, flight, Mars orbit, lander touchdown and rover performance.
    A tray full of GOLD is not worth a moment in time.

  7. #2757
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    Quote Originally Posted by OhOh View Post
    Fingers crossed for a successful launch, flight, Mars orbit, lander touchdown and rover performance.
    Seconded. Mars landing is hard. The Soviet Union/Russia has a proud history of 100% failures on their missions to Mars, both orbiters and landers, and there were plenty. You may count one as a success. It landed, it began to transmit one photo from the ground and failed after ~20 seconds.

    This Mars launch window is busy. There are 3 probes planned to go.

    The Chinese lander is now on the pad for launch. It is their first. If it fails, which is quite possible, they won't be discouraged, they will try again.

    The US rover 2020, now named perseverance is scheduled to lift off on July 30 with the launch window open until Aug. 15. There were a number of delays due to problems with payload integration and the ULA Atlas V rocket. Perseverance is basically a copy of Curiosity but with different science payload including a small helicopter. Perseverance will among other tasks select a number of mars samples that may get collected and brought back to Earth in the early 2030ies.

    The third mission is the first arab interplanetary mission. They send the Mars orbiter called Hope. It launches on a japanese launch vehicle. They say the order of their government was clear, build it, don't buy it. So they cooperate with the University of Boulder, Colorado in building it. The orbiter will add significantly to the knowledge on the martian atmosphere if their mission is successful.
    Last edited by Takeovers; 18-07-2020 at 09:47 PM.

  8. #2758
    Thailand Expat OhOh's Avatar
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    The Long March 5 heavy-lift has 4 booster.

    The Saturn V rocket has/had, no disposable boosters:

    Space News thread-m1mi7g5-jpg


    The Ariane family have a variety.

    Space News thread-2017-02-14-185041-350x288-jpg


    Space X has both:

    Space News thread-23sci-spacex1-jumbo-jpg


    Space News thread-spacex-has-assembled-starship-hopper-1-a


    What determines the launch rocket, boosters/thick single tube, configuration choice? Is it weight of the payload, the physical size of the payload or .... ?
    Last edited by OhOh; 19-07-2020 at 09:44 AM.

  9. #2759
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    Tianwen 1 is designed to operate for 90 days. Spirit and Opportunity were also expected to operate for 90 days.

    Spirit lasted almost 7 years and Opportunity lasted about 15 years! Let's hope that Tianwen 1 follows their example and is still sending us data in the 2030s.

    Space News thread-3507_pia03272-full2-jpg

  10. #2760
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    Quote Originally Posted by qwerty View Post
    Tianwen 1 is designed to operate for 90 days. Spirit and Opportunity were also expected to operate for 90 days.

    Spirit lasted almost 7 years and Opportunity lasted about 15 years! Let's hope that Tianwen 1 follows their example and is still sending us data in the 2030s.
    Given that the chinese moon rover already works for a long time the chances of Tianwen 1 are quite good. The environment on the Moon is that much harsher than on Mars.

  11. #2761
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    Quote Originally Posted by OhOh View Post
    What determines the launch rocket, boosters/thick single tube, configuration choice? Is it weight of the payload, the physical size of the payload or .... ?
    How many books are you prepared to read for an answer? There is a multitude of design driving issues.

    One of my favorites you may not find in books. The cancer of small side boosters as seen on Ariane and Atlas V is driven by the military. They just love different size solid boosters. The technology fits so well into their strategic arsenals. Tell that to the typical Old Space engineers and they will strongly deny this motivation. They are just incapable of thinking in economic efficiency terms. They believe it does not apply to rockets. Standard you get to hear "space is expensive".

    Identical or very similar 3 booster designs like Delta IV Heavy and Falcon Heavy are an attempt on increasing payload without need of designing a much bigger single core. Which is a valid approach if you don't intend to reuse them. FH cores are reused but separate landing, servicing and reassembling is not as efficient as doing it with a single bigger core.

    There are 2 stage designs and designs with more than 2 stages. 2 stage is more cost efficient and safer, with fewer risky events like stage separation and firing up a different main engine. But more stages are easier to reach high delta-v for high energy trajectories like GEO, moon and interplanetary. The Russians use more stages because 2 stage is harder, needs very efficient light weight designs, while 3-4 stages is more brute force.

    SpaceX Starship is a radically new design aiming at full reusability. Not ony the booster but the upper stage as well. Which requires extreme reliability through ability to work with some components failing. That's one reason it needs to be that big.

  12. #2762
    Thailand Expat OhOh's Avatar
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    Thanks for the insight.

  13. #2763
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    Looks like the UAE Mars Probe will launch aboard a Japanese rocket in a few hours.


  14. #2764
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    Reported a successful launch and as on it's way to Mars.

    For the UAE and China, there is 'Hope' in the Stars

    For the UAE and China, there is 'Hope' in the Stars - Opinion - Chinadaily.com.cn

  15. #2765
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    On their latest launch of a Korean military satellite SpaceX had a ful success. The satellite was delivered into its target orbit, which is by now routine and expected.

    Landing does not have 100% successrate but was perfect this time. Video with a time stamp for landing but well worth looking at the whole.



    But they never had full success in catching the fairing, this was a first.



    These fairings are quite expensive. Each half is about $3 million. Catching them is hard because they are so big and the wind blows them unpredictably. Steering with the parachutes is only partly effective. But if they can catch in only one attempt in 3 or 4 it is well worth the effort. Those 2 ships are quite expensive and highly maneuverable in all directions and it is still hard. Mostly they have failed so far. They can fish them out of the water but they are frequently damaged and need a lot more refurbishment. Catching them in the net is much better if they can do it.

  16. #2766
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    A fan video on space news. They are produced by a german-japanese couple living in München, Germany. Are japanese women like this? If for nothing else, watch the video just for her.



  17. #2767
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    Quote Originally Posted by OhOh View Post




    Space X has both:



    Space News thread-spacex-has-assembled-starship-hopper-1-a

    .... ?
    I am still staggered that it looks like something out of a 1950s comic, did they run a kids competition to design it

  18. #2768
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    Quote Originally Posted by NamPikToot View Post
    I am still staggered that it looks like something out of a 1950s comic, did they run a kids competition to design it

    Elon all by himself is kid enough. I hope that will never change. Though the legs look very different now, they are almost invisible, hidden inside. There will be aerodynamic surfaces to steer during descent.

  19. #2769
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    Quote Originally Posted by Takeovers View Post
    Are japanese women like this? If for nothing else, watch the video just for her.
    Yes, and yes.

  20. #2770
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    Quote Originally Posted by TheRealKW View Post
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    Originally Posted by Takeovers
    Are japanese women like this? If for nothing else, watch the video just for her.
    Yes, and yes.
    Thank you.

  21. #2771
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    China has successfully launched its Mars mission. It has an orbiter and a lander with a rover.

    The launch trajectory goes right over the wider Manila area with dense population.
    Space News thread-zvwmmdj4-jpg


    A short twitter video of the launch.

    https://twitter.com/libijian2/status...61844454019073

    NASA administrator Jim Bridenstine with a congratulation message and the wish for a successful mission.

    https://twitter.com/JimBridenstine/s...77196491575297

    With today’s launch, China is on its way to join the community of international scientific explorers at Mars. The United States, Europe, Russia, India, and soon the UAE will welcome you to Mars to embark on an exciting year of scientific discovery. Safe travels Tianwen-1!

  22. #2772
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    Has anyone been observing the Neowise comet?

    Tonight's Observing Guide from Hua Hin, Thailand | TheSkyLive.com

  23. #2773
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    Quote Originally Posted by Edmond View Post
    Has anyone been observing the Neowise comet?

    Tonight's Observing Guide from Hua Hin, Thailand | TheSkyLive.com
    A friend of mine took
    Photos. Top bright nightsky in my area. Would have to drive quite far to see it.

  24. #2774
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    As TO said I dont think it will be visible from BKK even in the burbs because of the city light... Will have a long look though tonight.

  25. #2775
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    Quote Originally Posted by aging one View Post
    Will have a long look though tonight.
    If you have a good binocular with big front lens and know exactly where to look it may be possible.

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