What sci-fi show is more realistic Battlestar Galactica or Babylon 5?

Great question but a difficult call. Obviously neither was "realistic" in any conventional sense - not on shows portraying FTL drives, jumpgates, aliens, human-level+ AI, etc. But it goes deeper. Both shows had elements of mysticism and "Clarke's Law" level technology (that is, events as easily explained by magic as technology - or vice versa). These tend to push the "science fantasy" classification for both shows which, almost by definition, reduces their realism or need for such.

Obviously it's not fair to consider the special effects. A decade of difference in technology plus a larger budget makes comparison at that level almost meaningless. Both had internal consistency issues, both had high and low points relative to the primary story arc. Acting was generally good in both but Battlestar Galactica again had advantages given its sponsoring network and intended audience - allowing more interesting and adult stories for some characters and events.

So... I'm going to mentally flip a coin and say Battlestar Galactica, despite its weak ending, narrowly beats Babylon 5 in the "hard SF" class and, by my way of thinking, is more "real", for good or bad, in its handling of the story and characters. I look forward to reading other opinions and reasoning.

Were aliens caught by NASA and NASA kept its secret?

While this doesn't exactly defuse the crazy conspiracy, IF aliens landed on earth, it wouldn't be NASA's jurisdiction to deal with them. NASA's just a scientific organization, it's not equipped to deal with the kind of stuff it would need to contain such an event.I suspect that the Department of

Are we a minuscule part of intelligent life in the universe?

Have a look towards the sky and all we can see is just merely a part of the universe,so isn't it possible that there are creatures out there beyond our knowledge. Well friends I am writing for my belief that there

When do cats purr?

There are multiple reasons why some cats purr. While most cats can purr certain big cats such as lions actually don't purr, they are considered roaring cats, and don't have the anatomy necessary to purr. Science isn't positive why cats purr, but there are some prevailing theories."A cat's purr begins in