Well, as long as people are actually bringing science into this...
K= mc^2[1/(1-v^2/c^2)^(1/2)-1]. I don't know how much Supergirl is supposed to weigh, but let's say 150 lbs= 68 kg (obviously she looks like she weighs a lot less, but who knows).
The scan of her smashing into that moon says she was traveling at v= 0.998c at the time of impact.
Doing the math, this would mean she'd have a kinetic energy of 9.0624E19 Joules. A one megaton explosion has 4.18E15 Joules of energy, so she was traveling with a kinetic energy of about 21.658 gigatons.
That's pretty impressive, but I believe destroying the earth requires a minimum of about 10^15 megatons, or a trillion gigatons of energy, so if the numbers on the scan are correct, then it would have indeed been a tiny moon, and she would not be even remotely near to earthbusting levels.
Relativity is a "theory" to about the same extent that the external universe universe actually existing is a "theory." All attempts to disprove relativity have failed, while all of the major predictions it makes, that I am aware of, have been verified at this point, in some cases with extremely high precision.
For those going on about "infinite mass," you might want to consider that something with infinite mass would also have an infinitely strong gravitational pull. All matter and energy in the universe would instantly be accelerated to lightspeed, all converging on you. Of course, at the same time you would cause an infinitely strong gravitational time dilation effect throughout the entire universe. Basically, all space and time would be immediately destroyed.
Of course, as pointed out, comics tend to overlook this little detail. Can't imagine why.
Uh, and what's this about the sun not producing nuclear energy? The sun supports itself against gravity via nuclear fusion. That's how heavier elements are made in the first place. Maybe you meant something else, but the sun absolutely produces nuclear energy. Pretty much all the energy we get from it is generated by nuclear processes.
As for Lobo. Well, I've got to agree with others on the comparisons to Superman being odd. I've never actually read any of their fights, but it just never made sense to me that Lobo could stalemate Supes. Sure he could be stronger and tougher. But he's never struck me as being particularly fast, and he can't fly and has no long range attacks. Supes should be able to essentially nuke him from orbit, if he really had to. For that matter, I have seen Lobo take on Green Lantern(s), and those fights also make little sense to me. The GLs have great range on their energy attacks. The idea that none of them think to engage Lobo from more than about 30 ft away just makes them look stupid. Or blitzing and tossing him out into space or something. BRB should be capable of doing the same, except he (and Thor) have always struck me as being far more comfortable (as well as versatile) with their long-range energy capabilities than Superman.
Edit: Somehow forgot the squareroot in the equation, which cuts her energy significantly, although it doesn't really affect the main point that she wasn't anywhere near earthbusting.
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