to correct some things: moon stabilizes earths axis not gravity without it = catastrophic climatic consequences. Also without the moon earth rotation would have stopped leading to half year long days and nights extremly fast never ending winds and one huge continental mass at equator everything else would drown.
bigger iron core is not important because of gravity but because of plate tectonics without it no land recycling all land would be washed into the sea also no co2 recycling which would lead to venus like environment
discovering alien radio signals which arent send to contact earth highly unlikely. they become very fast weak and cant be distinguished from background radiation we wouldnt notice earth2 10 lightyears away which is practically on our doorstep .
i believe we will discover life through analysis of exoplanet atmospheres in the next 100 years or find microbes in our solarsystem.
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