Events
Planet-sized object Eris, Haumea
and Makemake are discovered in
the Kuiper Belt.Arno Penzias and Robert Wilson
discover cosmic microwave
background radiation, further
evidence supporting the Big Bang
model.Edwin Hubble discovers evidence
of an expanding universe, which
supports the Big Bang model.Georges Lemaitre proposes
the Big Bang theory, which
suggests that the universe
began as a giant explosion
of energy.Ernst Opik demonstrates that
the Andromeda nebula lies
outside the Milky Way galaxy.Friedrich Bassel observes
stellar parallex-the apparent
movement of stars due to the
Earth's movement around the Sun.William Herschel constructs
the first map of the
Milky Way galaxy.Thomas Wright suggests
that the milky way galaxy
is a flattened disk of stars
and that nebulae might be
other galaxies.Galileo publishes his
Dialogue on Two World Systems,
which argues in favour of the
heliocentric model of the
universe.Ferdinand Magellan
is the first European
to observe the
Magellanic Clouds,
which are later recognised
as galaxies outside the Milky Way.
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