Questions tagged [neptune]

Neptune is the eighth and farthest planet from the Sun in the Solar System.

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Why haven’t we landed probes on Neptune, Jupiter, Saturn and Mercury with onboard cameras?

Why haven’t we landed probes on Neptune, Jupiter, Saturn and Mercury with onboard cameras? Voyager 1 and Voyager 2 were sent out in the 70’s, with 70’s technology, is there technology available that ...
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Mangalyaan + Trident; is it possible? escape the solar system using a low cost booster

5 years ago, India launched the Mangalyaan spacecraft to Mars, on a budget that raised eyebrows at the time. It was probably the Mars mission launched with the least powerful rocket; a feat only made ...
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21 votes
2 answers
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How can Trident be so inexpensive? Will it orbit Triton or just do a (slow) flyby?

The recent NY Times article Neptune’s Moon Triton Is Destination of Proposed NASA Mission says (in part): HOUSTON — Is it time to go back to Neptune? Scientists representing NASA’s Jet Propulsion ...
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When are there launch windows to Neptune via Jupiter?

I suppose there's a launch window to Neptune by using Jupiter as often as there are Jupiter/Neptune conjunctions, every 13½ years. But which years are Jupiter and Neptune best aligned for gravity ...
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Why there is no orbiter for Uranus or Neptune?

In the 21st century, why is there is no orbiter for Uranus or Neptune or at least their moons? It would definitely tell us more about the structure and composition of these planets. I know it must ...
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Mining of Uranus or Neptune

Some studies show that there are big 'seas' of diamonds on Uranus and Neptune, there may be loads of it. I was thinking, wouldn't it be a great business opportunity to go to Uranus or Neptune (maybe ...
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Why did Voyager 2 receive a gravitational slowdown (as opposed to a slingshot) at Neptune?

I was actually answering this question today regarding velocities of spacecraft, and it occurred to me I've never really looked at this graph in much detail before: Heliocentric velocity of Voyager 2 ...
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Why didn't Pioneer 11 visit Uranus/Neptune, and why didn't Voyager 1 visit Pluto?

The following image from NASA shows the flight paths of Pioneer 10, Pioneer 11, Voyager 1, and Voyager 2, as well as the positions of the outer planets. It seems to me that with a little tweaking of ...
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6 votes
2 answers
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What were the highest quality photos and knowledge of Uranus and Neptune before Voyager?

From my related question, I'm still in search of historical knowledge of the outer planets. That is, how our understanding of them developed over time. So right now I'm hunting for the highest ...
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Is it more challenging to put an airship in the Uranian than in the Venusian atmosphere?

The Soviet Union's (in cooperation with some European governments like France and West Germany) Vega missions put balloons in the atmosphere of Venus back in 1985. It was 30 years ago, the last ...
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To what extent could a single Triton flyby slow down a direct Hohmann transfer to Neptune for NOI?

I can't seem to find any good sources online for this, all I get are documents on how Nice model was used to compute Neptune's gravity capture of Triton via a binary dissociation, possibly because of ...
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