Last Updated：2025/12/29
Sentence
According
to
the
reigning
hypothesis,
about
4.5
billion
years
ago,
shortly
after
Earth
had
accreted
down
into
a
sphere
from
its
little
slub
of
circumsolar
material,
another
newborn
planet,
still
shaky
on
its
feet,
slammed
obliquely
into
Earth
with
terrifying
force.
That
"giant
impactor",
named
Theia,
who
in
Greek
mythology
was
mother
to
the
goddess
of
the
moon,
is
thought
to
have
been
roughly
the
size
of
Mars
and
to
have
been
pulverized
in
the
encounter,
along
with
a
good
chunk
of
the
proto-Earth.
From
that
fiery
cloud
of
all-Theia
and
part-Earth,
the
scenario
goes,
our
moon
soon
condensed.
Quizzes for review
According to the reigning hypothesis, about 4.5 billion years ago, shortly after Earth had accreted down into a sphere from its little slub of circumsolar material, another newborn planet, still shaky on its feet, slammed obliquely into Earth with terrifying force. That giant impactor
, named Theia, who in Greek mythology was mother to the goddess of the moon, is thought to have been roughly the size of Mars and to have been pulverized in the encounter, along with a good chunk of the proto-Earth. From that fiery cloud of all-Theia and part-Earth, the scenario goes, our moon soon condensed.
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