There was some (very minor) concern that the astronauts could have brought a previously unknown pathogen (space bug) back with them.
Although the Moon, as expected, was apparently devoid of lifeforms, there was still concern that some component of the lunar environment might prove harmful to life on Earth. Sterilization procedures were used, and the crew kept in isolation for 21 days (July 24 to August 13, 1969) to observe them for any sign of pathogens. They were visited by President Richard Nixon, who was aboard the USS Hornet for the Apollo 11 splashdown and astronaut recovery.
Apollo 11 stayed on the moon's surface due to the moon's gravitational force, which is about 1/6th that of Earth's. The Lunar Module's landing gear allowed it to safely touch down, and the astronauts' mass combined with the moon's gravity kept them anchored to the surface.
All of the Apollo spacecraft landed in the ocean, which is where they were designed to land. 3/26/10--The USSR landed their spacecraft on dry land because they had endless expanses of dry land to use. NASA chose the ocean because it was considered a safer landing surface and even if they missed the target by hundreds of miles, the thing still landed in water. The Apollo capsules were designed to float for a period of time and had some floatation aids onboard which could be deployed, as well as a liferaft. When recovering the astronauts, Navy Seals would attach a floatation collar to the capsule, then extract the astronauts. The floatation collar kept the capsule afloat long enough to be recovered aboard the ship. Since Apollo 13 never landed on the moon, the astronauts were not quarantined aboard the Iwo Jima and were free to wander around.
A number of items were left behind after every mission. They left behind trash, their PLiSS's (personal life support system, aka the backpack), science equipment (the Apollo 11 science package was called the EASEP, Early Apollo Scientific Experiment Package, future missions left behind an ALSEP, Apollo Lunar Surface Experiment Package), American Flags, the Descent Stages (the legs) of the Landing Modules, and some personal items which many astronauts have kept to themselves. Apollo's 15, 16, and 17 also left behind the Lunar Rovers.
Buzz Aldrin took Holy Communion on the moon during the Apollo 11 mission, which he kept private until after their return to Earth.
Apollo 1 never flew: the command module was destroyed by a fire on 27 January 1964, which killed astronauts Grissom, White, and Chaffee. The Apollo 1 name (officially Apollo-Saturn 204) was kept to honor their loss.
A jury is "sequestered" when kept in isolation during a trial.
Although the Moon, as expected, was apparently devoid of lifeforms, there was still concern that some component of the lunar environment might prove harmful to life on Earth. Sterilization procedures were used, and the crew kept in isolation for 21 days (July 24 to August 13, 1969) to observe them for any sign of pathogens. They were visited by President Richard Nixon, who was aboard the USS Hornet for the Apollo 11 splashdown and astronaut recovery.
"Apollo kept my father's sleep" is the first line from the poem entitled A Daughter of Admetus. This poem was written by Thomas Sturge Moore.
Geographic isolation
in 1969 the moon was conpletly foreingn. Who knows what kind of things are on the moon. The astronauts were placed in quarintine to ensure that they hadnt conracted any illnesses. It could have been a plauge, contagion. But luckily the astronauts were safe.
Apollo
Your question is confusing. The Apollo astronauts who landed on the Moon carried life support units on their backs. These packs they carried let the breath and kept their blood from boiling or freezing.
If you mean while the Lunar modules were descending to the surface and while they were on the moon, then the Apollo Command and Service Modules kept orbiting the moon. One of the astronauts stayed behind in it. The Command Module could relay messages from the earth to the astronauts on the lunar surface. The ascent stage of the Lunar Module eventually returned and docked at the forward end of the Command Module. *If I haven't understood your question properly, please add more information.
Apollo 11 stayed on the moon's surface due to the moon's gravitational force, which is about 1/6th that of Earth's. The Lunar Module's landing gear allowed it to safely touch down, and the astronauts' mass combined with the moon's gravity kept them anchored to the surface.
Strict isolation is when a person is highly contagious and need to be kept in isolation from everyone. This is to help protect others from acquiring the virus, disease, etc. Until the Doctors determine what it may be and/or the patient recovers completely.
.. Apollo