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Saturn’s majestic rings will vanish in just six months from now (www.earth.com)

submitted 2 months ago* (last edited 2 months ago) by [email protected] to c/[email protected]

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Note: The title is a bit clickbait (they'll merely become invisible from our line of sight), but I'm not going to editorialize the article title.

Come March 2025, Saturn's majestic rings will become virtually invisible to earth-based observers. This phenomenon occurs due to the unique tilt of Saturn's axis, which will position the rings edge-on to our line of sight. [...] Saturn's axial tilt, which is the angle its axis leans compared to its orbit around the Sun, is about 27 degrees. As Saturn moves during its 29.5 year orbit around the Sun, this tilt means different parts of its rings and moons get sunlight at different angles, changing how they look. So, the rings are not really disappearing but rather playing a celestial game of hide and seek. At their reappearance, we can also enjoy an accentuated view of Saturn's moons.

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[–] [email protected] 29 points 2 months ago (1 children)

That's not a stupid question at all. Was curious myself, and found this: https://sciencing.com/close-rocks-saturns-rings-13152.html

Compared with most other astronomical objects, the ice and rock particles in Saturn’s rings are extremely close together. On average, about 3 percent of the total volume of the disk is occupied by solid particles, while the rest is empty space. This may sound small, but it means the typical separation between particles is only a little over three times their average diameter. Assuming a value of 30 centimeters for the latter, the rocks would be as close as one meter away from each other. There is no hard and fast rule, however, due to density variations across the rings and the wide spectrum of particle sizes.

It would seem that the particles in Saturn's rings are more like the movie portrayals of asteroid fields: dangerously close together, and you wouldn't want to try to fly through them.

[–] [email protected] 2 points 1 month ago (1 children)

What if you had a giant vacuum nozzle at the front and shoot the ice particles out the back of your rocket? :D

Hmm that might actually not be so stupid. First there must be some gas pressure since water ice would sublimate otherwise, so that actually should help gather and guide particles.
Then if you would go slow enough the forces should be minimal and you could mine the water ice this way. Or extract solids and turn the water into big blocks of pykrete to reinforce the nozzle. Or use the blocks of ice to build a space habitat. Or accelerate waste out the back to accelerate again. You'd only need a reactor with enough power.

[–] [email protected] 1 points 1 month ago (1 children)

I want to say that if you're going slow enough relative to particles and in the same plane as them, you could probably just kind of bump them out of the way if they're not more massive than your ship. Note that I would not try that with my own spaceship but perhaps with a rental 😆

There's several hard sci-fi books where ice is harvested and used for shielding, melted for water/life support, etc almost exactly like you're describing.

[–] [email protected] 2 points 1 month ago* (last edited 1 month ago)

Yeah The Expanse is awesome but they are mining rather big ice chunks. In the Starcarrier series they find a giant shipyard churning through protoplanetary disk. Which sounds kind of ideal for mining raw materials for e.g. space habitats. But I guess a low gravity moon or asteroid would work just as well.