Title: How many potentially habitable planets are there? (2019)
Headings: How many habitable planets are there?
How many habitable planets are there?
Table of Contents
What makes a planet habitable?
How many habitable planets are there in our solar system?
How are planets discovered?
1. Looking for stars that wobble
2. Observing shadows
3. Taking photos
4. Detecting starlight that has been bent by gravity
How many planets have been discovered beyond our solar system?
What makes a planet habitable?
So…how many “habitable” planets are there?
Conclusion: habitable planets in numbers

Content: No, it does not – at least not for the purpose of this discussion as we can’t just land and walk around there. For this article, we are talking about planets where, if it were at all possible to get there, human beings could live without suits, air-tight shelters, and advanced terraforming (the process of altering a planet to make it habitable.) Artists’s impression of possibly habitable planet HD 189733b (Credit: NASA, ESA, M. Kornmesser). How many habitable planets are there in our solar system? There is only one habitable planet in our solar system: Earth. Although some planets, or planetary moons (like Jupiter’s Europa), could support some form of life such as bacteria or single-cell organisms, no other planet or celestial body in the solar system is capable of supporting humans. This means we need to look outside of our solar system, towards planets that revolve around a star other than our Sun. How are planets discovered?