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the core of next is the mach kernel with scource code from bsd unix
it displays postscript and has a windowing engine
and a object orientated application layer
it has a terminal ( its a nix after all )

Steve Jobs really loved the cube. Just look at the Mac G4 cube. NeXTstep, as everyone says, is greatly related to OS X, but what is the core name? The core of OS X is Darwin. Also, does it have a terminal like X and what is it like?

Actually NS stood for Next/Sun. The NS prefix was only introduced with OpenStep (not NextStep which used a NX prefix.)

Just for your information - you speak of the NeXT machines in the past tense but as of 1 year ago (probably still now) one of the Physics labs at Oxford University was entirely equipped with NeXT stations, with a Cube as a server. Quite simply, they had not come across anything which could replace them (although they were exploring Mac OS-X to that end) in terms of the network integration, messaging and programming facilities which they offer.
Meanwhile, my monitor stands on top of a 'color station' which just awaits a proprietory keyboard in order to switch it on for the first time in many years!

MacOS X is indeed an heir to NeXTstep, though the MACH-BSD kernal in NeXTstep was replaced my something much more modern in OS X. OS X inherits it's structure, notions of services, application bundles, GUI and display postscript (Called Quartz under OS X), use of "NetInfo" for most things from NeXTstep, but most of the "UNIX" is actually freeBSD.

it's interesting from a developers perspective to see all of the NeXTstep headers still in use, and NeXT-derived functions. For example, many header files and prototypes begin with the letters "NS", meaning "NextStep". :-)

MacOS 10 uses much the same kernel as NeXTStep. With the port of the Mac kernel to the PC, Intel-based machines can now run NeXTStep. Apple's updated release included a color(!) GUI and could be run on Macintosh computers.