LEM meaning in Space Science ?

Answer:

What is Lunar Excursion Module mean?

The Apollo Lunar Module, or simply Lunar Module (LM ), originally designated the Lunar Excursion Module (LEM), was the Lunar lander spacecraft that was flown between lunar orbit and the Moon's surface during the United States' Apollo program. It was the first crewed spacecraft to operate exclusively in the airless vacuum of space, and remains the only crewed vehicle to land anywhere beyond Earth.

Structurally and aerodynamically incapable of flight through Earth's atmosphere, the two-stage lunar module was ferried to lunar orbit attached to the Apollo command and service module (CSM), about twice its mass. Its crew of two flew the complete lunar module from lunar orbit to the Moon's surface. During takeoff, the spent descent stage was used as a launch pad for the ascent stage which then flew back to the command module, after which it was also discarded.

Overseen by Grumman, the LM's development was plagued with problems that delayed its first uncrewed flight by about ten months and its first crewed flight by about three months. Still, the LM became the most reliable component of the Apollo–Saturn space vehicle. The total cost of the LM for development and the units produced was $21.3 billion in 2016 dollars, adjusting from a nominal total of $2.2 billion using the NASA New Start Inflation Indices.

Ten lunar modules were launched into space. Of these, six were landed by humans on the Moon from 1969 to 1972. The first two launched were test flights in low Earth orbit—the first without a crew, the second with one. Another was used by Apollo 10 for a dress rehearsal flight in low lunar orbit, without landing. One lunar module functioned as a lifeboat for the crew of Apollo 13, providing life support and propulsion when their CSM was disabled by an oxygen tank explosion en route to the Moon, forcing the crew to abandon plans for a lunar landing.

The six landed descent stages remain at their landing sites; their corresponding ascent stages crashed into the Moon following use. One ascent stage (Apollo 10's Snoopy) was discarded in a heliocentric orbit after its descent stage was discarded in lunar orbit. The other three LMs were burned up in the Earth's atmosphere: the four stages of Apollo 5 and Apollo 9 each re-entered separately, while Apollo 13's Aquarius re-entered complete, following emergency maneuvers.

reference

Full Form	Category
Language Extention Module	Academic & Science
Light Electric Mobile	Academic & Science
Lemmon (sd)	Airport Code
Liquid Elastomeric Moulding	Business
Local Event Management	Business
Location Efficient Mortgage	Business
The LEarning Museum network project	Community
Leadership Exploration Meeting	Community
Lay Eucharistic Minister	Community
Lemuel	Community
Lutheran Episcopal Ministry	Community
Language Extension Module	Computing
Link Error Monitor	Computing
Line Extender Module	Computing
Lan Expansion Module	Computing
Lemur Finance	Cryptocurrency
Light Emotive Machine	Electronics
Large Eddy Model	General
Low End Mac	General
Log and Event Manager	General
Lunar Exploration Module	General
Low Equity Margin	General
Longitudinal Engine Mount	General
Lifecycle Emissions Model	General
League of Extraordinary Miniacs	General
Laboratorio Elettronico Mobile	General
Light Effect Manager	General
le Baron Medallion	General
Logic For Eco Modeling	General
Light Extinction Measurement	General
Learnable Evolution Model	General
Light And Electron Microscopy	General
Law Of Excluded Middle	General
Lentinula Edodes Mycelia	General
Lunar Escape Module	General
Law Enforcement Memorial	General
Log Event Manager	General
Law Enforcement Modificaton	Governmental
Law Enforcement Mechanism	Governmental
Life Energy Motion	Governmental
Linear Electric Motor	Governmental
Light Extinction Measure	Measurement Unit
Local Effect Model	Medical
Lentinus Edodes Mycelia	Medical
Light Easy Mobile	Military and Defence
Life Extension Mix	Military and Defence
Light Equipment Maintenance	Military and Defence
Lunar Entry Mode	Space Science
Laboratory Environment Model	Space Science
Launch Escape Monitor	Space Science
Lunar Excursion Module	Space Science
Lemmon Airport	Transport & Travel