What If Earth Had a "Twin" In Our Solar System?

Earth is a unique planet. Out of all the planets in our Solar System it’s the only one that’s developed life. But what if it’s not the only one out there? What if there’s a second Earth that also has life?

Let’s discover what would happen in this scenario. The whole field of astronomy and astrophysics would change and get extra funding. We’d wanna fully explore that second planet and those who live there and how. And of course, the inhabitants of our planet’s doppelgänger would definitely monitor our lives as well…