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.
planetary science - What are the dark areas on the moon? - Space ...
Denser areas of smaller impact craters are however just casting shadows on the Lunar surface, also making them appear darker than the average darkness of the Lunar surface, covered in regolith and with better light reflection properties. This answer is not based on any external reference. Please, let me know in the comments, if they are required.
How often does the ISS orbit align with the day/night terminator?
2014年6月3日 · In the following image (coming from SAT-Flare) you can see the orbit of the ISS (in red) and the day/night terminator (in blue). The terminator separates night from day along the surface of the Ear...
How to calculate the flight path angle, γ, from a state vector?
@Julio's excellent answer describes a flight path angle, and explains that it is the angle between the tangential direction (perpendicular to the radial vector to the central body) and the current
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)?