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Vor 19 Stunden · For example, Newton's laws explained thousands of years of scientific observations of the planets almost perfectly. However, these laws were then determined to be special cases of a more general theory ( relativity ), which explained both the (previously unexplained) exceptions to Newton's laws and predicted and explained other observations such as the deflection of light by gravity .
Vor 19 Stunden · Political philosophy. Philosophy of religion. Signature. Georg Wilhelm Friedrich Hegel [a] (27 August 1770 – 14 November 1831) was a German philosopher and one of the most influential figures of German idealism and 19th-century philosophy. His influence extends across the entire range of contemporary philosophical topics, from metaphysical ...
- Purpose and Function
- Operating Domains
- Propulsion Technology
- Planetary and Atmospheric Propulsion
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In-space propulsion begins where the upper stage of the launch vehicle leaves off; performing the functions of primary propulsion, reaction control, station keeping, precision pointing, and orbital maneuvering. The main engines used in space provide the primary propulsive force for orbit transfer, planetary trajectories and extra planetary landing ...
Spacecraft operate in many areas of space. These include orbital maneuvering, interplanetary travel and interstellar travel.
The technology areas are divided into four basic groups: (1) Chemical propulsion, (2) Electric propulsion, (3) Advanced propulsion technologies, and (4) Supporting technologies; based on the physics of the propulsion system and how it derives thrust as well as its technical maturity. Additionally, there may be credible meritorious in-space propulsi...
Launch-assist mechanisms
There have been many ideas proposed for launch-assist mechanisms that have the potential of drastically reducing the cost of getting into orbit. Proposed non-rocket spacelaunchlaunch-assist mechanisms include: 1. Skyhook(requires reusable suborbital launch vehicle, not feasible using presently available materials) 2. Space elevator(tether from Earth's surface to geostationary orbit, cannot be built with existing materials) 3. Launch loop(a very fast enclosed rotating loop about 80 km tall) 4....
Air-breathing engines
Studies generally show that conventional air-breathing engines, such as ramjets or turbojets are basically too heavy (have too low a thrust/weight ratio) to give any significant performance improvement when installed on a launch vehicle itself. However, launch vehicles can be air launched from separate lift vehicles (e.g. B-29, Pegasus Rocket and White Knight) which do use such propulsion systems. Jet engines mounted on a launch rail could also be so used. On the other hand, very lightweight...
Planetary arrival and landing
When a vehicle is to enter orbit around its destination planet, or when it is to land, it must adjust its velocity. This can be done using all the methods listed above (provided they can generate a high enough thrust), but there are a few methods that can take advantage of planetary atmospheres and/or surfaces. 1. Aerobraking allows a spacecraft to reduce the high point of an elliptical orbit by repeated brushes with the atmosphere at the low point of the orbit. This can save a considerable a...
In science fiction, space ships use various means to travel, some of them scientifically plausible (like solar sails or ramjets), others, mostly or entirely fictitious (like anti-gravity, warp drive, spindizzy or hyperspace travel).: 8, 69–77 : 142
Different Rockets Archived 2010-05-29 at the Wayback MachineEarth-to-Orbit Transportation Bibliography Archived 2016-06-15 at the Wayback MachineVor 19 Stunden · "Sir Isaac Newton vs. Bill Nye" Medium Rarities (2017) Original. From Epic Rap Battles of History; feat. Peter "Nice Peter" Shukoff and Charles "Chali 2na" Stewart "Skipper Dan" Internet Leaks digital EP (2009) Alpocalypse (2011) Original, in the style of Weezer. Based on the Jungle Cruise, an attraction in Adventureland in the Disney theme parks.
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