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2 votes

Is there a name for views of orbital paths that ignore some motions versus those that don't?

You have to be careful because of the way gravity works. Everything attracts everything, there are no pure Keplerian orbits. But if we ignore that and pretend say that the Sun is fixed, the Earth rota …
Freddie R's user avatar
  • 2,545
49 votes

Why does the sky of Mars appear blue in this video of pictures sent back by the Chinese rover?

Despite my comments about the sky not always being red, I think there is a simpler explanation. This video was made by a "content" company on a monetized YouTube channel. The screenshot is simply a co …
uhoh's user avatar
  • 151k
0 votes

Earth’s Orbit speed and apparent motion question

Make the position of the Earth at the midpoint in time (t=0) to be the origin. The sun is now at [-1 AU, 0]. Move the Earth backwards from the origin by two Earth diameters (25,512 km). Deposit a floa …
uhoh's user avatar
  • 151k
4 votes

Why does Earth not appear to be at the focus of TESS' elliptical orbit in this video?

So in a visualization with only traces of conic sections, there is no way to distinguish between orthographic and perspective projections. …
uhoh's user avatar
  • 151k
2 votes

Is the night sky on Earth different from the night sky on the moon or Mars?

According to @RobJeffries' answer: Even in favourable conditions, the optical depth of the Martian atmosphere is usally somewhere between 0.5 and 1 per airmass. (Petrova et al. 2012; Lemmon et al. 20 …
Community's user avatar
  • 1
0 votes

What kind of Visual Sensors are employed aboard Rockets?

There are several instances of GoPros (for example) used on the ISS but that's not a launch vehicle. GoPro cameras (for example) have been used on rockets in at least two places: SpaceX video: Falling …
Community's user avatar
  • 1