Re:New Horizons Reaches Ultima Thule
by radarsat1 on Tuesday January 01, 2019 @05:57PM
(#18802946)
I'm curious what is the reason to think there would be ring systems around these objects? Aren't rings usually associated with planets much larger than earth, whereas these objects are much smaller?
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Re:New Horizons Reaches Ultima Thule
by eponeponepon on Tuesday January 01, 2019 @07:47PM
(#18803393)
Long-lasting rings would be - fundamentally all you need for a ring to form is some debris and a gravity well.
To be clear, something that "doesn't last long" on an astronomical timescale could still quite happily exist stably for several dozen human lifetimes.