when the earth first forms four-and-a-half billion years ago it’s
four-and-a-half billion years ago it’s
four-and-a-half billion years ago it’s too hot to form with water but the
too hot to form with water but the
too hot to form with water but the planet has water now if it wasn’t
planet has water now if it wasn’t
planet has water now if it wasn’t delivered by comets then has it been
delivered by comets then has it been
delivered by comets then has it been here all along to find out where the
here all along to find out where the
here all along to find out where the water comes from professor Stephen
water comes from professor Stephen
water comes from professor Stephen lodges is looking for clues to when it
lodges is looking for clues to when it
lodges is looking for clues to when it first appears as a geologist he uncovers
first appears as a geologist he uncovers
first appears as a geologist he uncovers the planets past by looking at its rocks
the planets past by looking at its rocks
the planets past by looking at its rocks but the past has a big hole it’s called
but the past has a big hole it’s called
but the past has a big hole it’s called the Hadean or dark period because nobody
the Hadean or dark period because nobody
the Hadean or dark period because nobody knows anything about it the problem of
knows anything about it the problem of
knows anything about it the problem of the first 500 million years of Earth
the first 500 million years of Earth
the first 500 million years of Earth history for geologists has always been
history for geologists has always been
history for geologists has always been that you have a nightmare scenario where
that you have a nightmare scenario where
that you have a nightmare scenario where you don’t have any rocks or minerals to
you don’t have any rocks or minerals to
you don’t have any rocks or minerals to investigate it’s thought early Earth is
investigate it’s thought early Earth is
investigate it’s thought early Earth is a fireball of molten rock but with no
a fireball of molten rock but with no
a fireball of molten rock but with no evidence from this time it’s just a
evidence from this time it’s just a
evidence from this time it’s just a theory
theory
theory then in 2002 Moises makes an
then in 2002 Moises makes an
then in 2002 Moises makes an earth-shaking discovery the oldest
earth-shaking discovery the oldest
earth-shaking discovery the oldest mineral sample ever found on our planet
mineral sample ever found on our planet
mineral sample ever found on our planet a crystal of zircon
a crystal of zircon
a crystal of zircon [Music]
[Music]
[Music] locked inside these tiny grains is a
locked inside these tiny grains is a
locked inside these tiny grains is a vital clue chemical analysis of zircon
vital clue chemical analysis of zircon
vital clue chemical analysis of zircon crystals reveals whether they formed in
crystals reveals whether they formed in
crystals reveals whether they formed in the presence of water over seven years
the presence of water over seven years
the presence of water over seven years moisés finds and dates nearly 100
moisés finds and dates nearly 100
moisés finds and dates nearly 100 thousand crystals of zircon one stands
thousand crystals of zircon one stands
thousand crystals of zircon one stands alone
alone
alone the oldest one that we’ve found so far
the oldest one that we’ve found so far
the oldest one that we’ve found so far is four point three eight billion years
is four point three eight billion years
is four point three eight billion years old now I I’d like that to sink in when
old now I I’d like that to sink in when
old now I I’d like that to sink in when this crystal was made the earth was just
this crystal was made the earth was just
this crystal was made the earth was just 180 million years old if this line
180 million years old if this line
180 million years old if this line represents the age of the earth then the
represents the age of the earth then the
represents the age of the earth then the dinosaurs died out here
dinosaurs died out here
dinosaurs died out here rewind about four billion years to the
rewind about four billion years to the
rewind about four billion years to the end of the dark period
end of the dark period
end of the dark period the zircon crystal was formed here we’re
the zircon crystal was formed here we’re
the zircon crystal was formed here we’re talking about time spans that are beyond
talking about time spans that are beyond
talking about time spans that are beyond comprehension for instance in this rock
comprehension for instance in this rock
comprehension for instance in this rock here there are zircon crystals that are
here there are zircon crystals that are
here there are zircon crystals that are one third of the age of the universe
these things have been around for almost
these things have been around for almost as long as the earth has been a planet
as long as the earth has been a planet
as long as the earth has been a planet talk about time capsules analysis shows
talk about time capsules analysis shows
talk about time capsules analysis shows this 4.4 billion year old zircon crystal
this 4.4 billion year old zircon crystal
this 4.4 billion year old zircon crystal forms in liquid water rather than a dry
forms in liquid water rather than a dry
forms in liquid water rather than a dry planet the crystal reveals that early
planet the crystal reveals that early
planet the crystal reveals that early Earth already has water on its surface
”
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