Comments by "H. de Jong" (@h.dejong2531) on "" video.

Every single bit of video made by the Apollo crews can be found at the Apollo Flight Journal.
2
There is no dome. We can bounce radio signals off the Moon, and measure its distance from the delay in getting those signals back. This confirms the moon is at 380,000 km. Other objects in the sky are at different distances, confirming they are not on a dome, but objects in space.
1
It's pretty easy to establish that I can point an antenna at most places in the sky and get no reflected signal back, proving that there is no dome. The places that do reflect my signal back move at high speed (and we can measure this speed), proving that the reflection is caused by a moving object that operates in a way consistent with the laws of gravity (i.e. those objects are in orbit).
1
We can see satellites from the ground. With simple equipment we can measure their speed and altitude; we find speeds of 8 km/s for satellites at 400 km. Scott did a video on how to do this. No balloon has ever been above 50 km, no balloon has ever reached a speed of 1/100 that of a satellite. I can confirm that geostationary satellites are at 36,000 km above the equator by pointing a directional antenna at them from 3 different locations.
1
Without a technological masterpiece to examine the planet, a network of relays has nothing to do. So we build relays when we need them. Several satellites orbit Mars right now and function as relays for the missions on Mars' surface.
1
@there_can_only_be_one__unicorn Read up on the history of Mars exploration. The Mars Pathfinder lander was preceded by the Mars Global Surveyor orbiter and relay. Spirit and Opportunity were preceded by the orbiter and relay Mars Odyssey. And those orbiters had more functions than just relaying radio: they had their own instruments for examining Mars from orbit.
1
@there_can_only_be_one__unicorn The Apollo program was about two things: flagwaving (useful only in terms of political influence, but it paid the bills) and science (useful). In fact, as of now, science is the only useful goal of spaceflight. Technology hasn't advanced yet to the point where doing anything in space (outside Earth's orbit) has economic value (mining, colonies). Until we're there, we'll keep learning about our surroundings.
1
@there_can_only_be_one__unicorn I don't get the urgency. We have no-one to "catch up" to, we can do this at our leisure.
1
@sundhaug92 Vanguard's first stage was derived from the V-2 though.
1
@Ignat99Ignatov Russia and China have been the biggest contributors to space debris, by doing antisatellite missile testing.
1
That photo was taken in an airship hangar, 300 m long x 100 x 50 m. That little stripey object in the center is the access door on one side of the hangar, a door that measures 100 x 50 m. The camera's in that direction somewhere, far too small to see.
1