Top 10 Misconceptions about our Solar System
Do you think you know what’s what about our Solar System?
My name is Humblebee
and you’d watching ASTRUM
We’re going to count down the top ten misconceptions
about our Solar System.
Let’s see if you believed any of these before watching this!
10.The Sun is a burning ball of fire.
The Sun is glowing, not burning like a fire.
The Sun glows because its temperature is
about 5,500 degrees Celsius.
The heat is not produced by burning(a chemical reaction).
but rather by fusion (a nuclear reaction)
These nuclear fusion takes place deep in the Sun’s core
at a temperature of about 15 million degrees.
As the heat travels out through the Sun’s layers,
it becomes much cooler,
but still very much hot enough to glow in visible light.
Now while 5,500 degrees seems cool compared
to 15 million degrees,
that’s still hot enough to melt most metals.
Just to give a comparison,
a wood fire burns at about 500 degrees.
9. Pluto is the most-distant and last object in the solar system.
Pluto resides within a region of icy objects called the Kuiper Belt.
The Kuiper Belt extends from Neptune’s orbit outward.
Beyond Pluto’s orbit is another vast region of icy objects
called the Oort Cloud, which, like the Kuiper Belt,
is a home to icy comets.
There’s even four dwarf planets
that we know about that are further,
and some even bigger than Pluto.
它们是哈乌美亚 乌神星 厄里斯和克瑞斯
There’s Haumea, Makemake and Eris and Ceres
Eris is currently about 3 times as far away from the sun as Pluto
and Sedna which is not yet technically been classified as drawf plant
Although it pretty much as one
can be amass of 937 astronomical unit(AU)
away from the Sun.
That in other words is 31 times NEPTUNE distance from the sun
Some of astronauts even believed it is the first
no-member of it in Oort Cloud
8.Saturn is the only planet with rings.
While many of us were taught in school
that Saturn had amazing rings, made up of small rocks,
ice and other particles,
实际上 还有其他几颗行星 拥有星环
there are actually several other planets that also have rings around them.
In fact, all of the larger planets
in the solar system have been found to have rings.
这是事实 木星环从地球上看不到 海王星环同样如此
This is true of Jupiter whose rings can not be seen from our planet as well as Neptune.
Even Uranus has nine bright rings around it,
as well as a few fainter ones
but all of these are difficult to see, due to the distance.
7.Comets come from regions outside the solar system.
Comets are part of the solar system.
Scientists believe they come from one of two locations within the solar system:
the Kuiper Belt and the Oort Cloud.
The comets that we see often
every 100 years come from the Kuiper Belt,
and comets that we see rarely
every few thousand years come from the Oort Cloud.
6.Asteroids in the Asteroid Belt are very close to each other.
Thanks to Star Wars and other Hollywood space movies,
we have the impression that asteroids
are always bashing into each other and spaceships
whatever a hard time navigating an asteroid field.
Asteroids though are not close to each other
The asteroid material is so thinly
distributed that numerous unmanned spacecraft
have traversed it without incident
they are roughly 1 million miles from each other,
and the total mass of the asteroid
belt is only just 4% of the mass of the Moon.
5.Mercury is tidally locked to the Sun like
the Moon is to Earth.
For many years it was thought that Mercury
was synchronously tidally locked with the Sun,
rotating once for each orbit and always
keeping the same face directed towards the Sun,
in the same way that the same side of
the Moon always faces Earth.
Radar observations in 1965
proved that the planet has a 3:2 spin–orbit resonance
rotating three times for every two revolutions around the Sun.
The original reason astronomers
thought it was tidally locked was that,
whenever Mercury was best placed for observation,
It was always nearly at the same point
in its 3:2 resonance, hence showing the same face
4.Mercury is the hottest planet in the Solar System.
While it is sensible to think that Mercury is the hottest planet
due to it being the closest planet to the Sun,
it’s just simply not true.
It turns out that Venus is actually a hotter planet than Mercury,
even though it is further away.
The reason for this is that Mercury doesn’t have an atmosphere
because it’s so close to the Sun
which means that there is nothing to hold the heat in.
Venus, on the other hand,
has a notoriously thick atmosphere
that traps the heat created by the sun.
The max temperature you’ll find on Mercury is 426 degrees celcius
while the average temperature on Venus is 462 Celsius
3.The Sun only accounts for a small part of what’s in the Solar System.
I’m sure you guessed the Sun is big.
the sun actually makes up over ninety-nine percent
of all of the mass in our entire solar system.
Jupiter and some of the other large planets
make up most of the rest,
and Earth barely even registers in the equation.
We can be glad the Sun is as large as it is though,
as it makes everything in the solar system work
giving us light,heat and energy
while holding everything together
in their orbits using its massive gravity.
2.Comets always have tails.
Comets do not always have tails.
They developed a fuzzy, shell-like cloud called a coma,
接近太阳时 还会产生1条 2条或3 条尾巴
and one, two or three tails when near the Sun.
A comet tail and coma are illuminated
and may become visible from Earth when a comet
passes through the inner Solar System,
the dust reflecting sunlight directly
and the gases glowing from ionisation.
Interestingly, while the solid nucleus of comets
is generally less than 50 km across,
the coma may be larger than the Sun,
and ion tails have been known
to extend 3.8 astronomical units (355 million miles).
Also the tail will always point away from the Sun
Comets have no coma or tail when far away from the Sun.
1.The Solar System formed during the Big Bang
along with the rest of the Universe.
The Solar System is a lot younger than the universe.
According to scientific research,
the current estimate of the age of the universe is 14 billion years,
while it is believed
that the Solar System is only 4 and a half billion years.
The Solar System is said to have
formed from the gravitational collapse
of a giant molecular cloud.
Most of which became our Sun,
the rest forming everything else found in the Solar System.
What other misconceptions have you
heard about our Solar System?
Post in the comments below.
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Thanks for watching!