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Creative Speculation

In reply to the discussion: Message auto-removed [View all]

bananas

(27,509 posts)
42. The rocket creates its own atmosphere to push against.
Tue Mar 3, 2015, 03:56 PM
Mar 2015

If I understand your question, you're asking how a rocket can work without anything to push against.
Rockets use either solid or liquid fuel.
The fuel is burned, forming an extremely hot gas.
This gas rapidly expands and pushes against the rocket nozzle.
In effect, this gas is the "atmosphere" the rocket is pushing against.

Here are photos of Apollo 8's trans-lunar injection, you can see the exhaust gasses expanding behind the rocket, pushing the rocket towards the moon:

The first post-launch sightings are represented by a spectacular series of predawn photographs, shown at right, from the Smithsonian Astrophysical Observatory (SAO) station on Maui (courtesy Smithsonian Astrophysical Observatory). The first one shows the TLI burn near 15:44 UT on December 21. As the spacecraft passed Hawaii, the changing perspective put the camera view looking up the sunlit exhaust plume. For various missions, TLI took place between 2 hours 50 minutes and 3 hours 12 minutes after launch (1.5-2.1 revolutions). John Stonesifer, NASA Recovery Team Leader, deployed to the South Pacific aboard the carrier USS Yorktown, both for planned recovery and in case of early mission abort. He reports that the crew had an excellent view of TLI from the carrier deck (and that a similar sight was visible from the Hornet for Apollo 11). He notes somewhat ruefully that "My biggest disappointment was that with all the NASA photographers aboard as part of our team we did not get any photographs of the sightings".



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Message auto-removed [View all] Name removed Mar 2015 OP
Jet engines don't. Rockets use an oxiddizer/fuel mix. ret5hd Mar 2015 #1
Message auto-removed Name removed Mar 2015 #7
What would an illustration of a jet engine not working look like? ret5hd Mar 2015 #11
Message auto-removed Name removed Mar 2015 #13
Here is a good link. hack89 Mar 2015 #2
Message auto-removed Name removed Mar 2015 #3
Google Newton's Third law and find an image. hack89 Mar 2015 #4
Message auto-removed Name removed Mar 2015 #5
Why didn't you simply type your original question into Google? hack89 Mar 2015 #6
Message auto-removed Name removed Mar 2015 #8
Did you read and understand the link I sent you? hack89 Mar 2015 #9
Funny - when I go to google I get plenty of pictures hack89 Mar 2015 #10
Message auto-removed Name removed Mar 2015 #12
Do you believe that rockets work in space? hack89 Mar 2015 #14
Message auto-removed Name removed Mar 2015 #15
How about I teach you how to use Google hack89 Mar 2015 #16
Message auto-removed Name removed Mar 2015 #17
Results for a Google image search for "how does a rocket engine work" arcane1 Mar 2015 #19
Message auto-removed Name removed Mar 2015 #21
It works in space too. Atmosphere isn't needed. arcane1 Mar 2015 #22
Message auto-removed Name removed Mar 2015 #24
My link has thousands of pictures showing exactly that. arcane1 Mar 2015 #26
Message auto-removed Name removed Mar 2015 #36
Why would atmosphere be needed? The oxygen is on-board. arcane1 Mar 2015 #39
Message auto-removed Name removed Mar 2015 #41
Like this? Nitram Mar 2015 #20
Message auto-removed Name removed Mar 2015 #23
Fine, here is a NASA picture. arcane1 Mar 2015 #28
Message auto-removed Name removed Mar 2015 #31
There are thousands of drawings and diagrams in my link. Take a look! arcane1 Mar 2015 #32
Message auto-removed Name removed Mar 2015 #34
One more post. You can stop being lazy and lookup the rest yourself. arcane1 Mar 2015 #35
Message auto-removed Name removed Mar 2015 #37
Show evidence an atmosphere is needed. arcane1 Mar 2015 #38
Message auto-removed Name removed Mar 2015 #40
It's impossible to post a picture of a jet engine working without air. arcane1 Mar 2015 #18
Message auto-removed Name removed Mar 2015 #25
You know what a jet engine is, right? arcane1 Mar 2015 #27
Message auto-removed Name removed Mar 2015 #29
Air pumps need air in order to, you know, pump it. arcane1 Mar 2015 #30
Message auto-removed Name removed Mar 2015 #33
The rocket creates its own atmosphere to push against. bananas Mar 2015 #42
Message auto-removed Name removed Mar 2015 #43
Here's a NASA webpage with some helpful graphics bananas Mar 2015 #45
Message auto-removed Name removed Mar 2015 #46
Message auto-removed Name removed Mar 2015 #44
Why? zappaman Mar 2015 #47
I think he is a Moon Landing Truther. nt hack89 Mar 2015 #48
No, those people don't really exist anymore. zappaman Mar 2015 #49
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