4. The prospect of life on Saturn:
It’s not confirmed, but it was speculated that Enceladus, the icy geyser moon of Saturn, might be a place for life. The planet which is composed almost entirely of hydrogen and helium, with only some traces of water ice in its lower cloud deck will keep scientists busy, giving them a hint of life.
5. Bermuda Triangle:
The Bermuda Triangle is one of the great unsolved mysteries of the world, a section of ocean in the western North Atlantic where ships and aircrafts have disappeared under deeply suspicious circumstances. Included in this list is the infamous “Flight 19”, a group of 5 bombers who went on a routine training exercise in 1945 and never returned, as well as the search and rescue plane that went looking for them the same day. There is also the case of the USSCyclops, a US Navy boat that disappeared in 1918 with all 309 crew on board as well as the Connemara IV, a pleasure yacht, found adrift in 1955 with all the crew missing.
6. The Zodiac Letters:
Many of the unsolved mysteries of the world are actually murder mysteries with one of the most infamous cases being that of the “Zodiac Killer”. A serial killer operating in California in the 1960’s and 70’s, he sent a series of taunting letters to the local press, referring to himself as “Zodiac” and including a total of four crytograms. In the decades since, only one of these ciphers has ever been decoded. Numerous suspects have been investigated, but despite the enormous man hours that went into the investigation, both the murders and the letters remain unsolved.