Usually 30 days or a little longer depending on how new is the battery.
Black dwarf stars, they have cooled off so much they emit no detectable light (but some emit small amounts of microwaves that are barely detectable).
The benefits of having a black box in a plane is that in case of a crash, the black box would be available to investigators immediately. This would save much time and have immediate actions for the crash emergency.
Quasars are the most radiant objects in space. They contain a central black hole surrounded by a disk of gas and dust. They emit large amounts of radio waves but not much visible light.
Too much !
500g
For a fatal crash costs can soar to:
Crash grossed $101,173,038 worldwide.
who more likelly to die bike or car crash
Car crash fines can differ depending on its damage.
Crash grossed $55,334,418 in the domestic market.
a lot
1% of the worldds emissions