# Tag Info

14

Indeed the presence of water has been confirmed. The late 1980s mission Giotto confirmed the existence of water on a comet well-known to mankind - Halley's Comet. Wikipedia states: Measured volume of material ejected by Halley 80% water, 10% carbon monoxide 2.5% A mix of methane and ammonia. Other hydrocarbons, iron, and sodium were detected in trace ...

12

Well, we can't observe it with the Hubble telescope. It's just too small. From astroengine.com Using the equation: $(d / D) × c = φ$ where $d$ is the diameter of the Oort Cloud comet (some estimates put this number at an upper limit of 300 km for the diameter of a cometary nucleus), $D$ is the distance from the Oort Cloud to Hubble (0.3 light years, or \$3×...

11

If you placed Voyager 1 in the Oort cloud right now, it'd be difficult to contact it (but maybe not impossible). We can barely communicate with the Voyagers now at ~140 AU using a 70 m DSN antenna. The DSN can use the VLA (one of the largest radio telescopes on Earth), that may provide enough aperture to receive the Voyagers. Calculations later. Most of ...

9

I actually see two questions here: "Is Voyager 2 capable of proving the existence of Oort cloud?" and "Are the Voyager probes still considered within The Solar System?" (Not 100% sure on these, this is my understanding so far:) The boundary of the Heliosphere is considered to be one of the boundaries of our solar system. The Oort cloud is already located ...

7

Assuming the voyager probes had enough power in their RTGs, had working instruments and could transmit data back to Earth it's still very unlikely they would be able to prove the existence of the Oort Cloud. The instruments on the spacecraft are not designed to detect Oort Cloud objects, which are theoretically small, sparse and likely to be pretty dark ...

6

The existence of water on comets is not really news, we can detect it by many means, for example by mass spectrometry analysis of comets' tails and coma using ground based or orbited observatories, so I'll rather point out maybe a bit more interesting fact that we have actual direct evidence through the collected and returned to Earth samples taken by the ...

6

Interstellar comets are icy bodies traveling in the areas between stars. They're just like the comets in the Oort Cloud, with the exception that they've been ejected from whatever stellar system they formed in. Wikipedia cites a good paper that analyzes the distribution of these comets, The Demographics of Long-Period Comets by Paul J. Francis. Francis gives ...

2

Use radar. (or even just light detection, with a suitable flashbulb) Just use a slightly more energetic pulse generator, allowing a spherical impulse to still be strong enough to get a detectable echo from an AU of distance away. I advise the "Tsar Bomba" brand of pulse generator for this.

2

First, everything in the Oort Cloud is really, really far apart. You could spend years looking and never see anything because of the reasons you gave. As for your ideas… The shadows idea is a great one, and might be your best bet, depending on the size of the objects and the equipment you have with you. You'd probably have to look in a lot of ...

1

documentary called "The Electric Comet," and the narrator claims that water has never been collected or detected from comets. Obvious lies (or extremely outdated info) and the title indicates that it was about "Plasma cosmology" presented as viable (or maybe even the best) cosmological model. Relatively good info about this is available for example at ...

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