Terra, or planet Earth, is 1 trillion (1,000,000,000,000 or 1x1012)
km3 in volume.
The Solar system, including the Oort Cloud, is 1.7
duodecillion (1.7x1039) km3 in volume.
The Milky Way galaxy is 33 quarttuordecillion (3.3x1046)
km3 in volume.
The observable
Universe is 213 duovigintillion (2.13 x 1071) km3 in
volume.
The entire
Universe may be as big as 21.3
untrigintillion (2.13 x 1097) km3 in volume. That doesn’t even take into account all the
other universes in the Multiverse of which we are a part, much less the rest of
the multiverses in the Omniverse.
A single human is, on average, 664 billionths
(0.000000000664 or 6.64x10-11) km3 in volume.
There are around
8.8 billion class-M (Earth-like) planets (out of 100 billion total) in the
Milky Way galaxy alone, likely inhabited by sentient and intelligent humanoid
species. Pretending that humans are the
median and that our current population is the average, that means there are as
many as 61.6 quintillion (6.16x1019) humanoids in our galaxy.
Planet Earth is
4.54 billion years old.
The Solar system is
4.56 billion years old.
The Milky Way
galaxy is 13.2 billion years old.
The Universe is
13.8 billion years old since the (most recent) Big Bang.
The average life expectancy of a human at birth worldwide is
67.2 years.
The entire human race, Homo
sapiens sapiens, has been around only 200,000 years of the 13.8 billion
years this Universe has existed.
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