Mercury

[griff]

And not all at the same time.

[6EQUJ5]

Indeed in galactic terms the entire solar system is just one dot on such a map, if even that. But Mercury is the closest planet to the Sun and is hotter than Hell. The habitable zone for anything better than a microbe is thought to be definitely Earth of course and just possibly Mars.

Some astro-biologists reckon that there is a slight possiblity of Europa (one of Jupiter's moons) and / or Enceladus (one of Saturn's moons) having microbes beneath their thick icy surfaces in the liquid water below. But even if there is such life it can have no substantial development possibilies.

But it would be an exciting discovery. To have life on Earth and on one of those moons would satisfy astro-biologists that our universe is teeming with life, given two or three such close examples.