Mindey, 
Distributed Cell-Phone Based Night Surveys
Utilize billions of phone cameras, while charging battery at nights, to watch the sky for phenomena.
Many of us geeks and nerds know that long-exposure night photography works pretty well with modern phones.
So, just creating an app, that monitors the sky collecting light while charging the phone at night, that activates automatically, when plugged in to charge at night (e.g., when sensors say it's dark, battery is charging, and no significant accelerometer motion is detected, and Wi-Fi connection is used), could be used to record, compress and send astronomic data for a decentralized research of the skies. It could be run intensively, utilizing its compute and network, because at those times it would be plugged in to the grid and Wi-Fi.
The users could set up custom data servers to send the data to, and this way, collectively run night surveys. Who knows what they could discover? Undocumented satellites, UFOs, NEOs, and maybe something else that we didn't know of.
范围还不够大，需要扩大到其他地方，可能功能可以扩展到不限于流星监视
No, no, surveillance cameras may need to monitor the ground all the time. But mobile phones do not work during the day and night. Moreover, people/phones sleep differently around the world for 24 hours, so if they monitor the sky while sleeping, there will be a 24-hour uninterrupted monitoring network covering the entire celestial sphere, which is too powerful!
不不不，监控摄像机们可能需要一直监控地面。但是手机们确实是白天工作夜晚不工作的。而且全球24个小时人们/手机睡觉的时间不一样，那么如果都是睡觉的时候监控天空的话，就有了覆盖全天球的24小时不间断的监视网络，太强大了！
Yes, it can use them more efficiently
对啊，这样可以更高效率地利用它们
[transiency] so, the surveillance cameras should point to skies, when idle? :)
Well, most surveillance is now staring at people on the ground. We need to change our way of thinking. It is a good idea to let the phone monitor the sky at night.
嗯，现在多数监控是盯着地面上的人，我们需要转变一下思考方式。让手机在夜里监视天空是个好主意。