Any Quote by Seth Shostak

The usual metric for whether a planet is habitable or not is to ascertain whether liquid water could exist on its surface. Most worlds…

— Seth Shostak

Most certainly, some planets are not inhabited, but others are, and among these there must exist life under all conditions and phases of development.

— Nikola Tesla

In days gone by, scientists would speak solemnly about our solar system's 'habitable zone' - a theoretical region extending from Venus to Mars, but…

— Seth Shostak

There are other planets besides the Earth and Mars. I'd like to remind you that studying Venus is vital to understanding life elsewhere.

— David Grinspoon

Mars is the only place in the solar system where it's possible for life to become multi-planetarian.

— Elon Musk

Mars is much closer to the characteristics of Earth. It has a fall, winter, summer and spring. North Pole, South Pole, mountains and lots…

— Buzz Aldrin

Ocean planets might be very common in the universe because water is very common in the low-temperature environments where planets form and evolve. This…

— Dimitar Sasselov

The story seems to be that almost every star has a planetary system... and, also, the definition of 'habitable zone' has expanded. In our…

— Frank Drake

In the mind of the public, the word 'planet' carries a significance lacking in other words used to describe planetary bodies... many members of…

— Alan Stern

“Since 1995, astronomers have found nearly two thousand confirmed planets around other stars. Some of these planets are similar to Earth in size and…

— Bill Nye

We have altered the physical, chemical and biological properties of the planet on a geological scale. We have left no part of the globe…

— David Suzuki

Now since in so many Things they... agree, what can be more probable than that in others they agree too; and that the other…

— Christiaan Huygens