crewed spaceflight - Who really coined the phrase "Light the …
Light the candle!". Gustav Holst's Op. 32 "The Planets" starts playing in the background (I believe a passage from act 4, Jupiter, the Bringer of Jollity ) and seconds after, the countdown resumes and the the first American manned suborbital spaceflight launches.
identify this object - Stanley Kubrick used a NASA-inspired lens to ...
2019年8月7日 · This lens was used on the interior scenes for Barry Lyndon. And in some scenes the interiors were only lit with candle light. This would have been impossible to capture on motion picture film as there didn’t exist a motion picture lens to capture a proper exposure in such low lighting conditions.
the moon - Lunar surface illumination levels - Space Exploration …
2020年4月18日 · I am trying to determine the lunar surface near or far side daytime illumination levels in Lux or foot-candles but there seems to be no directly measured values available. I did find this information on the levels as measured from earth, so it should be possible to work backwards to arrive at those values I presume.
Why isn't someone building a fully reusable solid fuel rocket?
2016年11月14日 · $\begingroup$ This question is kinda like asking why don't people make reusable candles instead of making oil lamps. In a SRB or a candle the fuel is part of the structure of the object so "refueling" it means rebuilding it rather than just filling up a tank and makes the process much more complicated. $\endgroup$
What happens to materials which burn up during reentry?
2017年8月25日 · What is the destination for mass of a candle when you light it up? Same things will happen if some inbound spacecraft speed towards earth surface hitting air molecules. Only difference is the outer shell of spacecraft is too hard to burnout totally like a candle but remains mostly intact losing very few amount of mass by various forms including ...
interstellar travel - Space Exploration Stack Exchange
2021年4月7日 · For speeds the fixed spectra lines of compounds absorbing light can be used to determine Doppler shift. As noted speed of light means that for more distant observations these events are those that happened in the past, so the assumptions are built on nothing in the laws of physics having changed over that intervening period.
Calculate flight path angle given semi-major axis, eccentricity and ...
2020年5月4日 · How can I, given the semi-major axis (α), the eccentricity (ε), and the distance from the focal point (r), calculate the flight path angle (φ)?
Why does the International Space Station have a downward facing …
The light you see is sunlight reflected off the station's enormous solar power arrays, and can only be visible when the observational conditions are dark enough that the bright spot of the station isn't lost in the sunlit background, and the arrays reflect sunlight towards you, so when the station is not in Earth's shadow.
interstellar travel - Maybe I can't really reach the speed of light ...
And as you might know, your mass increases as you approach light speed, by a factor (1-v 2 /c 2)-1/2. In other words, as you approach light speed your mass goes to infinity. That in turn means with a constant force your acceleration decreases to zero, but it never becomes zero.
colonization - Growing Mars crops in sunlight vs LEDs - Space ...
2022年8月9日 · Many crop plants will be at or near light saturation even in Martian sunlight. Noon sunlight on a clear day on Earth is about 2000 μmol/m 2 /s, so on Mars it will be about 890 μmol/m 2 /s. Per this table , spinach, in sunlight, has a light saturation point of 857 μmol/m 2 /s.