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For this reason L is called the "cosmological constant."
The cosmological constant (if it is positive) gives a repulsion that tends to counteract the mutual gravitational attraction of the matter.
If the cosmological constant has precisely the right value, then the new equations do admit solutions in which the universe is static and eternal, with an exact counterbalancing of the effects of matter and the new cosmological term.
The addition of this cosmological constant term was a perfectly logical step for Einstein to take.
By a curious twist of fate, how- ever, evidence has come from astronomical observations in just the last few years that suggest strongly that there might be a cosmological constant after all.
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