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GEEKS ARE SEXY TECHNOLOGY NEWS


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MASTERS OF THE UNIVERSE: REVOLUTION GETS A FIRST TRAILER [VIDEO]

> From Kevin Smith, Mattel Television Studios, and Netflix comes an epic tale
> that features He-Man vs. Skeletor in a highly anticipated brawl for all of
> Eternia. Masters of the Universe: Revolution premieres January 25th, only on
> Netflix.

[Netflix]


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January 11, 2024 Geeks are Sexy Geeks, General, Music & Movies 0 Comments



SADNESS SPENDING [COMIC]

[Source: @adhdinos]


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January 11, 2024 Geeks are Sexy Comics, General, Humor 0 Comments




HOW IT’S MADE: MASS PRODUCING 500,000 ZINC-CARBON BATTERIES PER DAY [VIDEO]

Even though Zinc carbon batteries are super cheap, it doesn’t make this video
any less interesting. Be sure to turn on CC!

[Miracle Process Via TA]


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January 11, 2024 Geeks are Sexy General 0 Comments



TODAY’S HOTTEST DEALS: SAVE BIG ON TURBOTAX DELUXE 2023, GOOGLE PIXEL WATCH,
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January 11, 2024 Geeks are Sexy Gadgets, General 0 Comments



HOW DO GUARDS SOUND THE ALARM SO QUICKLY? [COMEDY SKETCH]

> NPC guards activating the alarm like this should be impossible!

[VLDL]


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January 11, 2024 Geeks are Sexy Games, Geeks, General, Humor 0 Comments



WHEEL OF QUIRKS [COMIC]

[Source: @cactusfacecomics]


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January 11, 2024 Geeks are Sexy Comics, General, Humor 0 Comments


WHAT IF THE EARTH SUDDENLY STOPPED SPINNING? [SCIENCE VIDEO]

> What would happen if the Earth and all terrestrial objects suddenly stopped
> spinning, but the atmosphere retained its velocity?

[xkcd’s What If?]


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January 11, 2024 Geeks are Sexy General, Science 0 Comments



SICK [COMIC]

[Source: @wheatcomics]


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January 11, 2024 Geeks are Sexy Comics, General, Humor 0 Comments


MAN BUILDS WORLD’S FIRST FLYING UMBRELLA THAT FOLLOWS YOU AROUND [VIDEO]

Youtuber “I Build Stuff” build a drone powered flying umbrella that follows you
around as you walk. I mean, it’s 2024, so why doesn’t everyone have one yet?

[I Build Stuff]


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January 10, 2024 Geeks are Sexy General 0 Comments


EARTH ISN’T THE ONLY PLANET WITH SEASONS, BUT THEY CAN LOOK WILDLY DIFFERENT ON
OTHER WORLDS

Nearby planets can affect how one planet ‘wobbles’ on its spin axis, which
contributes to seasons. Mark Garlick/Science Photo Library via Getty Images




Gongjie Li, Georgia Institute of Technology

Spring, summer, fall and winter – the seasons on Earth change every few months,
around the same time every year. It’s easy to take this cycle for granted here
on Earth, but not every planet has a regular change in seasons. So why does
Earth have regular seasons when other planets don’t?

I’m an astrophysicist who studies the movement of planets and the causes of
seasons. Throughout my research, I’ve found that Earth’s regular pattern of
seasons is unique. The rotational axis that Earth spins on, along the North and
South poles, isn’t quite aligned with the vertical axis perpendicular to Earth’s
orbit around the Sun.

That slight tilt has big implications for everything from seasons to glacier
cycles. The magnitude of that tilt can even determine whether a planet is
habitable to life.


SEASONS ON EARTH

When a planet has perfect alignment between the axis it orbits on and the
rotational axis, the amount of sunlight it receives is fixed as it orbits around
the Sun – assuming its orbital shape is a circle. Since seasons come from
variations in how much sunlight reaches the planet’s surface, a planet that’s
perfectly aligned wouldn’t have seasons. But Earth isn’t perfectly aligned on
its axis.

This small misalignment, called an obliquity, is around 23 degrees from vertical
for Earth. So, the Northern Hemisphere experiences more intense sunlight during
the summer, when the Sun is positioned more directly above the Northern
Hemisphere.

Then, as the Earth continues to orbit around the Sun, the amount of sunlight the
Northern Hemisphere receives gradually decreases as the Northern Hemisphere
tilts away from the Sun. This causes winter.

The obliquity marks the difference between the Earth’s spin axis (blue) and the
vertical from orbit (green). The Northern Hemisphere experiences summer when the
tilt lines it up directly with light from the Sun. Gongjie Li




The planets spinning on their axes and orbiting around the Sun look kind of like
spinning tops – they spin around and wobble because of gravitational pull from
the Sun. As a top spins, you might notice that it doesn’t just stay perfectly
upright and stationary. Instead, it may start to tilt or wobble slightly. This
tilt is what astrophysicists call spin precession.

Because of these wobbles, Earth’s obliquity isn’t perfectly fixed. These small
variations in tilt can have big effects on the Earth’s climate when combined
with small changes to Earth’s orbit shape.

The wobbling tilt and any natural variations to the shape of Earth’s orbit can
change the amount and distribution of sunlight reaching Earth. These small
changes contribute to the planet’s larger temperature shifts over thousands to
hundreds of thousands of years. This can, in turn, drive ice ages and periods of
warmth.

Earth’s seasons result from a variety of factors, including orbit and axial
tilt.




TRANSLATING OBLIQUITY INTO SEASONS

So how do obliquity variations affect the seasons on a planet? Low obliquity,
meaning the rotational spin axis is aligned with the planet’s orientation as it
orbits around the Sun, leads to stronger sunlight on the equator and low
sunlight near the pole, like on Earth.

On the other hand, a high obliquity – meaning the planet’s rotational spin axis
points toward or away from the Sun – leads to extremely hot or cold poles. At
the same time, the equator gets cold, as the Sun does not shine above the
equator all year round. This leads to drastically varying seasons at high
latitudes and low temperatures at the equator.

When a planet’s spin axis is tilted far from the vertical axis, it has a high
obliquity. That means the equator barely gets any sunlight and the North Pole
faces right at the Sun. Gongjie Li




When a planet has an obliquity of more than 54 degrees, that planet’s equator
grows icy and the pole becomes warm. This is called a reversed zonation, and
it’s the opposite of what Earth has.

Basically, if an obliquity has large and unpredictable variations, the seasonal
variations on the planet become wild and hard to predict. A dramatic, large
obliquity variation can turn the whole planet into a snowball, where it’s all
covered by ice.


SPIN ORBIT RESONANCES

Most planets are not the only planets in their solar systems. Their planetary
siblings can disturb each other’s orbit, which can lead to variations in the
shape of their orbits and their orbital tilt.

So, planets in orbit look kind of like tops spinning on the roof of a car that’s
bumping down the road, where the car represents the orbital plane. When the rate
– or frequency, as scientists call it – at which the tops are precessing, or
spinning, matches the frequency at which the car is bumping up and down,
something called a spin-orbit resonance occurs.

The orbits of planets close by and the precession motion of a planet on its axis
can affect seasonal patterns. Gongjie Li




Spin-orbit resonances can cause these obliquity variations, which is when a
planet wobbles on its axis. Think about pushing a kid on a swing. When you push
at just the right time – or at the resonant frequency – they’ll swing higher and
higher.

Mars wobbles more on its axis than Earth does, even though the two are tilted
about the same amount, and that actually has to do with the Moon orbiting around
Earth. Earth and Mars have a similar spin precession frequency, which matches
the orbital oscillation – the ingredients for a spin-orbit resonance.

But Earth has a massive Moon, which pulls on Earth’s spin axis and drives it to
precess faster. This slightly faster precession prevents it from experiencing
spin orbit resonances. So, the Moon stabilizes Earth’s obliquity, and Earth
doesn’t wobble on its axis as much as Mars does.


EXOPLANET SEASONS

Thousands of exoplanets, or planets outside our solar system, have been
discovered over the past few decades. My research group wanted to understand how
habitable these planets are, and whether these exoplanets also have wild
obliquities, or whether they have moons to stabilize them like Earth does.

To investigate this, my group has led the first investigation on the spin-axis
variations of exoplanets.

We investigated Kepler-186f, which is the first discovered Earth-sized planet in
a habitable zone. The habitable zone is an area around a star where liquid water
can exist on the surface of the planet and life may be able to emerge and
thrive.

Unlike Earth, Kepler-186f is located far from the other planets in its solar
system. As a result, these other planets have only a weak effect on its orbit
and movement. So, Kepler-186f generally has a fixed obliquity, similar to Earth.
Even without a large moon, it doesn’t have wildly changing or unpredictable
seasons like Mars.

Looking forward, more research into exoplanets will help scientists understand
what seasons look like throughout the vast diversity of planets in the universe.

Gongjie Li, Assistant Professor of Physics, Georgia Institute of Technology

This article is republished from The Conversation under a Creative Commons
license. Read the original article.




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January 10, 2024 Geeks are Sexy General, Science 0 Comments


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