What do we call planets that can support life as we know it?
Super-Earths
Habitable worlds
Home planets
Water is very common in the universe, but, according to Anbar, what necessary-to-life condition are scientists searching for on other planets?
Water that contains an abundance of sodium ions
Water in its liquid state (notice or vapor)
Water that remains a constant temperature (with minimal variation)
Why does Mars have no oceans at its surface?
All water on Mars would turn into vapor because Mars is too close to the Sun resulting in surface temperatures that exceed water's boiling point
There is no water on Mars in any form
Because Mars is small, it has less gravity and has lost its water to space
Why do planets need to have an atmosphere in order for liquid water to exist?
Planets without an atmosphere are in a vacuum, and liquid water is unstable in a vacuum (it boils away or freezes)
There is no such thing as a planet without an atmosphere
Water enters another state of matter (called hydrogrix) when present on planets without an atmosphere
What makes Venus an uninhabitable world?
It's atmosphere is nearly 100% carbon dioxide causing surface temperatures hot enough to melt lead (too hot for liquid water)
It lacks an atmosphere causing a vacuum-like environment in which no life is thought to be able to survive
Temperature varies so greatly between boiling hot and freezing cold, it's believed that no life forms could survive there
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