Does Earth 2 still exist?

Excuse me, I've been hearing a lot about this concept called "Earth 2" recently. Could you please clarify for me whether this hypothetical second planet or parallel universe still exists in the realm of scientific theory or popular imagination? Is there any credible evidence or ongoing research that suggests its continued existence, or has it been largely dismissed as a mere fantasy? I'm genuinely curious to understand the current stance on this fascinating concept.