It's important to understand that "habitable" is a spectrum. While no other planet in our solar system is considered currently habitable for humans in the way Earth is, some could potentially be made habitable with advanced technology.

Here's a breakdown of the planets in our solar system and their habitability:

Definitely NOT Habitable:

* Mercury: Extremely hot, with no atmosphere to speak of.

* Venus: A runaway greenhouse effect makes it incredibly hot and has a toxic atmosphere.

* Mars: While there's potential, Mars is currently very cold, has a thin atmosphere, and lacks a global magnetic field to protect from solar radiation.

* Jupiter, Saturn, Uranus, Neptune: Gas giants with no solid surface and extreme temperatures.

Potentially Habitable with Major Modifications:

* Mars: Some scientists believe terraforming Mars (making it more Earth-like) could be possible, though it's a monumental challenge.

* Europa (moon of Jupiter): There's evidence for a subsurface ocean, but it's likely frozen and under immense pressure.

* Enceladus (moon of Saturn): Similar to Europa, this moon has a subsurface ocean and possibly hydrothermal vents, potentially creating conditions for life.

Important Note: Our understanding of habitability is constantly evolving. As we learn more about the universe, we may discover new possibilities and redefine what makes a planet habitable.