What is the role "that" and "just" to contain the newspaper heading below? Thanks in advance.
That Pluto Probe Just Might Save Earth
This is my understanding of it.
"That" is being used to refer to "something that is already known about" (meaning A1: http://dictionary.cambridge.org/dictionary/british/that ) i.e. Most of the readers will have already heard about the Pluto probe, and indeed the writer assumes that everyone knows about it.
"Just", I think, is being used in its form which expresses the fact that there is only a slight chance of something happening. (Meaning B1 "be possible": http://dictionary.cambridge.org/dictionary/british/just ).
So, "That Pluto Probe Just Might Save Earth" = "[You already know about] That Pluto Probe [,it is pretty unlikely but it] Just Might Save Earth".
Others can probably explain it better.
Last edited by Rover_KE; 22-Jul-2015 at 22:18. Reason: Fixing typo
(BrE first language speaker.)