Editing Exoplanets and the Search for Life (section)

== <span style="color: #FFFFFF;">Analyzing</span> ==
{| class="wikitable"
|+ Is the Earth Rare?
! Feature !! Why it helps life !! How common is it?
|-
| Magnetic Field || Protects atmosphere from solar wind || Requires a liquid iron core
|-
| Large Moon || Stabilizes the planet's tilt (Seasons) || Very rare (formed by a collision)
|-
| Plate Tectonics || Recycles Carbon / Regulates temp || Requires water and specific internal heat
|-
| Jupiter-like neighbor || Acts as a 'vacuum cleaner' for asteroids || Common in some systems, rare in others
|}

**The Concept of "The Great Filter"**: If life is common, why haven't we heard from anyone? The Great Filter theory suggests there is a step in evolution that is almost impossible to pass. Are we the first to pass it (meaning the filter is behind us), or is every civilization destroyed before they can travel the stars (meaning the filter is ahead of us)? Analyzing the Fermi Paradox is a core task of Astrobiology.
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