Questions tagged [moons]

Questions about celestial bodies that orbit another celestial body.

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8
votes
1answer
440 views

Why were Nix, Cerberos and Styx discovered later than Charon?

Charon, a moon of Pluto, was discovered in 1978. Today we know that Pluto has three additional moons, but they were discovered 3 decades later? Also, Hubble Space Telescope was in operation since 1990 ...
4
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1answer
139 views

Is the equatorial mountain range of Iapetus due to cold erosion?

Iapetus, satellite of Saturn, has a huge mountain range along about half its equator. On this list of our solar system's biggest mountains, it is the only entry with uncertain origin. ..The ...
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1answer
4k views

Satellites in retrograde vs prograde orbit [closed]

I read somewhere that Israel launched satellites in retrograde orbit. America also has some satellites in retrograde orbit. I am new to this concept, so I am curious: 1. What are the benefits/...
11
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1answer
497 views

Is it possible for moons to have their own moons?

I'm wondering, if it's possible for moons to have their own natural satellites, something big enough to be spherical? Stars have planets, planets have moons. Is it possible that moons have moons too?
6
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1answer
1k views

Are there any natural circular orbits?

I just saw How does orbital eccentricity affect positions of Lagrange points $L_4$ and $L_5$? and it questions the difference between circular and elliptical orbits. We know the Moon does not have a ...
5
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1answer
190 views

Will JUNO do any science of Jupiter's Moons?

It seems like the primary focus of JUNO is to get a better idea of how Jupiter works. The Science Objectives listed on Wikipedia don't seem to include anything about Jupiter's moons, other than a ...
10
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1answer
343 views

How seriously did astronomers take the idea of a hollow Phobos?

Phobos, the larger moon of Mars, was once theorized to be hollow by Iosif Shklovsky. Plenty of publications reference the idea (such as this snippet from Popular Science), but did anyone take it ...
6
votes
1answer
541 views

What is responsible for the different colors of Iapetus?

Iapetus, one of the moons of Saturn, is known for having two distinct color regions, one bright and the other dark. This was noted as early as the 17th century. This region can be seen below, and even ...
6
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3answers
418 views

Does NASA plan to land on Europa?

I recently studied that life may exist on Europa, an icy moon of Jupiter. Does NASA plan to land a spacecraft on Europa to study its environment in the near future?
2
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1answer
2k views

Are there photos taken by rovers, with both moons visible in the martian night sky?

Are there night photos from curiosity or early of Mars's skies? Two moon on the sky. Photos from ground. From rovers. Perhaps not exactly like this: but more like this: but at night and two moons.

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