麻豆淫院

It has been said that the atmosphere on Titan is so dense that a person could strap a pair of wings on their back and soar through its skies.

It鈥檚 a pretty fascinating thought. And Titan 鈥� Saturn鈥檚 largest moon 鈥� is a pretty fascinating place. After all, it鈥檚 the only other body in our solar system (besides Earth, of course) that has that type of atmosphere and evidence of liquid on its surface.

鈥淎s far as its scientific interest, Titan is the most interesting target in the Solar System,鈥� Dr. Jason W. Barnes of the University of Idaho told Universe Today.

That鈥檚 why Barnes and a team of 30 scientists and engineers created an unmanned mission concept to explore Titan called AVIATR (Aerial Vehicle for In-situ and Airborne Titan Reconnaissance). The plan, which primarily consists of a 120 kg plane soaring through the natural satellite鈥檚 atmosphere, was published online late last month.

The goal of the plane concept 鈥� which according to Barnes can serve as a standalone mission or as part of a larger Titan-focused exploration program 鈥� is to study the moon鈥檚 geography (its mountains, dunes, lakes and seas), as well as its atmosphere (the wind, haze, clouds and rain. Did you know that Titan is the only other place is our solar system where it rains?)

AVIATR is composed of three vehicles: one for space travel, one for entry and descent into Titan, and a plane to fly through the atmosphere. AVIATR, estimated to cost $715 million, would not prevent other missions from occurring on Titan, Barnes said. Instead, it would supplement the science being done by other projects.

鈥淭he science that AVIATR could do complements the science that can be accomplished from both orbiting and landed platforms,鈥� the article stated.

Unfortunately, it seems like the plane concept won鈥檛 be happening anytime soon.

That鈥檚 because Titan didn鈥檛 make the National Research Council鈥檚 鈥淒ecadal Survey鈥� 鈥� a prioritization of future planetary missions.

鈥淭itan was deferred to another decade,鈥� Barnes said.

But, he hopes to continue to build support for AVIATR so that it can get onto the next decadal survey in 2020. 鈥淲e certainly had a lot of interest from people. We are breaking the paradigm that a balloon was the right way to go to Titan,鈥� Barnes said.

So, why send an unmanned plane to study Titan鈥檚 atmosphere?

鈥淭itan is the best place to fly an airplane in the whole solar system. We can go when and where we want,鈥� Barnes said, adding that when compared to Earth, there鈥檚 four times more air and seven times less gravity on Titan. 鈥淎 balloon is stuck in the wind.鈥�

According to the article:

鈥淎 balloon entrained in primarily zonal winds near the equator would have no mechanism by which to travel to the polar regions to observe lakes and shoreline processes. Even if it were possible to get there, it is not clear that it would be desirable to send a balloon to the poles where Titan鈥檚 most violent meteorological activity takes place. AVIATR is both able to fly to the poles and is sufficiently robust to survive there.鈥�

There鈥檚 also this issue: A shortage of plutonium-238.

鈥淭he radioactive decay of plutonium-238 provides the heat that powers RTGs, which can power spacecraft where there is insufficient sunlight for solar panels to operate. NASA is presently investing in a new type of RTG, called the ASRG,鈥� the article stated. 鈥淎 traditional hot-air balloon will not work on Titan with an ASRG owing to its lower heat production. In contrast, the AVIATR mission is specifically enabled by the use of ASRGs. The power density (in Watts per kilogram) and longevity of the ASRG allow an electrically-powered aircraft to fly on Titan.鈥�

A plane could also find potential landing spots for future exploration. And, 鈥渟ince we are flying, we fly west the whole time so we can stay on the day side of Titan,鈥� Barnes said.

That daylight would also help AVIATR collect photographic data during its travels and, according to Barnes, when it鈥檚 time to downlink that information, the plane would conserve energy by gliding through the air.

鈥淎nd in doing so, we can also sample of bunch of altitude ranges,鈥� Barnes said. 鈥淲e are sampling the whole time.鈥�

The plan seems interesting enough, but it鈥檒l be quite a while before any data from the prospective mission would be coming back to Earth. If the plan is accepted (the earliest being 2020), the project would still have to be built, then once completed it would take 7 1/2 years to reach Titan. Once there, the mission would take about a nominal Earth year to study.

鈥淚 now realize that it鈥檚 a career-long project,鈥� Barnes said to Universe Today. 鈥淭he plan at this point is to keep this in the forefront of people鈥檚 minds and take whatever new ideas that people suggest and try to improve its prospect for selection.

To view the complete proposal, published in Experimental Astronomy, go .