Well, it's obviously habitable or we would not be here to question it!.
Why? The main reasons are:
Suitable temperature range for life.
Plentiful supply of water that circulated from brine (sea-water) to fresh (rain, snow, dew) and back.
An atmosphere containing oxygen and shielding the planet's surface from harmful levels of solar radiation.
- All three reasonably stable over sufficiently long time (geologically) for life to develop.
Chat with our AI personalities
mars
mars
Earth became habitable due to a combination of factors including its distance from the sun, presence of liquid water, protective magnetic field, and a suitable atmosphere. These conditions allowed for the development of life over billions of years.
earth is the only known habitable place because its the only one with water, food, and has the right temperature range for life as we know it, but scientists are discovering planets a lot like earth, but none are habitable for humans
About 0.5 AU, or about half the distance from Earth to the sun.