00:01We have just seen an asteroid so massive that its impact could be anointed a whole continent.
00:08It's almost a record speed.
00:12But what really worries me is that it plays a cache-cache with our instruments.
00:17It can slip into the light of the sun and disappear.
00:22And yes, it's still happening.
00:25It's volatilized.
00:27When we will see it, will we have time to prepare it?
00:31Or will it be already too late for humanity?
00:34That's it? I have your attention?
00:38So, 2025 SC69.
00:42The name is a little long.
00:44The name is also called Scooby.
00:46This astéroïde recently discovered is the kind of furtive,
00:49and likes to hide in the sun.
00:52It's like trying to see a luciole near a stade.
00:56The light hits the eyes and hits everything that is more diffuse.
01:01You will not see so much the luciole.
01:04The astéroïdes are hiding in the same way.
01:07When they walk away from the sun,
01:09they see it from the earth.
01:11They submerge our telescopes,
01:13and the weak light reflected by the astéroïde.
01:31The moon is crucial.
01:37The moon is crucial.
01:38The moon is crucial.
01:44The moon is crucial.
01:46Because it is the only way to catch an astéroïde at risk
01:49before it ne surprise the Earth.
01:51The scientists say that if one of these astéroïdes
01:54astéroïdes crépusculaires s'approchaient un jour,
01:57la menace d'impact serait sérieuse.
02:00And it's during one of these sessions of observation
02:02au crépuscule
02:03that researchers have finally spotted this giant astéroïde.
02:07We were the 27 September 2025.
02:10Scott Shepard,
02:11astronome in an institute based in Washington,
02:13passing the ciel to the fin,
02:15at the end of everything that could seem habitually
02:18in our solar system.
02:19And it had a remarkable tool.
02:21The Dark Energy Camera,
02:24or DECAM.
02:25The one of the rays of the sky
02:27the most powerful in the world,
02:29designed to detect objects
02:30few light on large portions of the universe.
02:33At a moment,
02:35he noticed a point pâle
02:36which was moving to the image.
02:38He then pointed out
02:39the point camera in its direction,
02:41and things are becoming more interesting.
02:44His movement seemed to see
02:45what astronomers expected
02:47of astéroïdes orbit very close to the Sun.
02:50Then,
02:51observations of survey
02:52with the Gémini and Magellan
02:54confirmed the discovery.
02:56Yes,
02:57it was quite an astéroïde.
02:59And it presented
03:00two very exciting features.
03:03First,
03:04he is fast.
03:05Very fast,
03:06even.
03:06In reality,
03:08he has the second orbit
03:09astéroïdes
03:09the most rapidly
03:10known in the solar system.
03:11He has a complete
03:12orbit around the Sun
03:14every 128 days.
03:15In terms of comparison,
03:17Mercury,
03:17the planet
03:18the most close to the Sun,
03:19met 88 days
03:20to achieve a revolution.
03:22Then,
03:24his orbit is extremely rare.
03:25He is only the second
03:26object known
03:27to remain entirely
03:28inside the orbit of Venus.
03:30This is also
03:31the one of the rare astéroïdes
03:38astéroïdes
03:39of the Earth.
03:41The astronauts
03:42have only identified
03:43some of them
03:44just here.
03:45And
03:46SC69
03:47occupies the 39th place
03:48on the list.
03:49The team also established
03:50that this astéroïde
03:51is of a great size.
03:53About 700 meters
03:54in diameter.
03:55This corresponds
03:56to about the height
03:57of the tower Merdeka
03:58118,
03:59the second
03:59most high
04:00world's world.
04:02If an astéroïde
04:03of this size
04:04hit a day
04:05on Earth,
04:06it would not be just
04:07serious,
04:07it would be a catastrophe.
04:10We are talking
04:10about damage
04:11on the scale
04:11of a continent.
04:13It would open
04:13a gigantic crater
04:15then would cause
04:16a wave of shock
04:17quite powerful
04:17to break the forest
04:19and destroy the cities.
04:21Some seismic
04:22would travel
04:22the Earth
04:23causing
04:24a wave of magnitude
04:257,24
04:26and we would still
04:28feel
04:28about 500 kilometers
04:30from the impact point.
04:31And this would not be done.
04:33a violent
04:34surpression
04:34atmospheric
04:35would be
04:36brisant
04:37des vitres
04:37at more
04:381600 kilometers.
04:40Then
04:40comes
04:41the
04:41debris
04:44in the atmosphere
04:45could block
04:46a part of the light
04:47and perturb
04:48the climate.
04:49I know,
04:50there is where
04:51to worry.
04:52But
04:53reassure-vous.
04:54Heureusement,
04:55SC-79
04:56will not be done
04:57because
04:58it is not
04:58on a collision
04:59with the Earth.
05:01For the moment,
05:03the calculations
05:03indicate
05:04that it will not pass
05:05close to our planet.
05:06At least,
05:07there is still
05:09a lot of
05:09to learn about
05:10this asteroid,
05:11but the studies
05:12will attend.
05:14For the moment,
05:15it has disappeared
05:16behind the Earth
05:17and is not visible.
05:18When it will reappear,
05:20the astronauts
05:21will examine
05:21the more close
05:22and try to know
05:23more about
05:23its composition.
05:25It is a crucial point
05:26because this asteroid
05:27survives
05:28in a way
05:28or another,
05:29all in orbit
05:30so close to the
05:31implacable
05:32of the Earth.
05:34The fact is
05:34that this asteroid
05:35will approach
05:36a lot of the Earth.
05:37At its point
05:38the most close,
05:39it receives almost
05:40six times
05:40the Earth.
05:43At this distance,
05:44its surface
05:45can reach
05:45about 600 degrees.
05:47What scientists
05:48do not know
05:49yet,
05:50it is how
05:50a massive rocket
05:51so massive
05:52can be heated
05:53again and again
05:54and there are
05:57two other points
05:57that the astronomers
05:58want to verify
05:59when they come back
06:00to our field
06:01of vision.
06:02The speed
06:02at which they turn
06:03and their light
06:04apparent.
06:05I hear the amount
06:07of solar light
06:08that they think
06:08because the asteroids
06:09do not produce their own
06:11light.
06:11They are simply
06:12big blocks
06:13of the light
06:13that they shine
06:14towards us
06:15the light of the Earth.
06:17These indices
06:18can help
06:19to determine
06:20what did Scooby
06:22the light
06:22A hypothesis
06:23is that this asteroid
06:24contains a lot of metals
06:25dense,
06:25which would explain
06:26how it supports
06:27the brutal heat
06:28of the Earth.
06:29And if it was confirmed,
06:31it could be a vestige
06:32of the time
06:33where the solar system
06:34was in formation.
06:36Or,
06:37it could be a little bit
06:39of the Earth
06:39because the gravity
06:41of Venus
06:41and Mercury
06:42slowly
06:42and again
06:44for millions
06:45of years.
06:46Even that
06:47SC-79
06:48does not represent
06:49a real danger
06:50for us,
06:52many to learn
06:52about it.
06:53The simple fact
06:54of the discover
06:55is already important.
06:56It reminds us
06:57that big asteroids
06:58can escape.
06:59Thus,
07:00even in our own
07:01own cosmos,
07:02there are still
07:04angles morts
07:05where the big objects
07:06can remain
07:07dissimulated
07:07until the good moment
07:09of the day
07:09to reveal.
07:10And as soon as
07:12our detection tools
07:13progress,
07:13we will discover
07:14still more
07:15asteroids.
07:16At this day,
07:17researchers
07:18have identified
07:18more than a million
07:19in the solar system.
07:21They decline
07:22in all the
07:22sizes.
07:23Like Vesta
07:24large
07:25about 530
07:26kilometers
07:26up to
07:27more small
07:28than a house.
07:30Among all
07:31the asteroids
07:32known,
07:33about 40,000
07:34are what we call
07:35the Asteroids
07:36Geo-Croiseur
07:37or NEA.
07:38This means
07:39simply
07:39that their orbit
07:40brings us
07:40to our region.
07:42Techniquement,
07:43their point
07:43the most close
07:44is inferior
07:45to 1,3 times
07:47the distance
07:47Terre-Soleil.
07:48It's quite close
07:49so that the
07:49crew of the
07:50Earth
07:50is
07:54precisely
07:54that
07:55we can
07:56stop.
07:57Nobody needs
07:58to lose
07:59sleep
07:59in imagining
08:00a asteroid
08:00hit our planet.
08:02Every time
08:03scientists
08:03discover
08:04a new
08:04object
08:05across the Earth,
08:06then
08:07determine
08:10its trajectory
08:11on the
08:12years,
08:13and this
08:16is not done
08:16as well.
08:17The
08:18automated systems
08:18of NASA,
08:20like Sentry,
08:21constantly
08:21review the
08:22catalogue
08:23of asteroids
08:23and evaluate
08:24if one of them
08:25could be a chance
08:27to touch the Earth
08:28in the next 100 years.
08:30If something
08:31is risky,
08:32they come up
08:33to the surveillance list
08:34and make an object
08:35of a rigorous
08:35survey.
08:36So yes,
08:38there are almost
08:382,000 asteroids
08:39close to the Earth
08:41who have, technically,
08:42a chance
08:42to reach us
08:43in the next 100 years.
08:44But inutile
08:45to panic.
08:46Most people
08:47are small
08:47and inoffensive
08:48like me,
08:50and their probability
08:50of impact is generally
08:52below 1%.
08:53You see
08:54why I said
08:55that you don't need
08:55to worry?
08:56Perfect.
08:57Now,
08:58sleep well.
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