The sun, Earth, and many other planets are surrounded by giant magnetic bubbles.
Space may seem empty, but it’s actually a dynamic place, dominated by invisible forces, including those created by magnetic fields. Magnetospheres – the areas around planets and stars dominated by their magnetic fields – are found throughout our solar system. They deflect high-energy, charged particles called cosmic rays that are mostly spewed out by the sun, but can also come from interstellar space. Along with atmospheres, they help protect the planets’ surfaces from this harmful radiation.
It’s possible that Earth’s protective magnetosphere was essential for the development of conditions friendly to life, so finding magnetospheres around other planets is a big step toward determining if they could support life.
But not all magnetospheres are created equal – even in our own backyard, not all planets in our solar system have a magnetic field, and the ones we have observed are all surprisingly different.
Earth’s magnetosphere is created by the constantly moving molten metal inside Earth. This invisible “force field” around our planet has an ice cream cone-like shape, with a rounded front and a long, trailing tail that faces away from the sun. The magnetosphere is shaped that way because of the constant pressure from the solar wind and magnetic fields on the sun-facing side.
Earth’s magnetosphere deflects most charged particles away from our planet – but some do become trapped in the magnetic field and create auroras when they rain down into the atmosphere.
Mercury, with a substantial iron-rich core, has a magnetic field that is only about 1% as strong as Earth’s. It is thought that the planet’s magnetosphere is stifled by the intense solar wind, limiting its strength, although even without this effect, it still would not be as strong as Earth’s. The MESSENGER satellite orbited Mercury from 2011 to 2015, helping us understand our tiny terrestrial neighbor.
After the sun, Jupiter has by far the biggest magnetosphere in our solar system – it stretches about 12 million miles from east to west, almost 15 times the width of the sun. (Earth’s, on the other hand, could easily fit inside the sun.) Jupiter does not have a molten metal core like Earth; instead, its magnetic field is created by a core of compressed liquid metallic hydrogen.
One of Jupiter’s moons, Io, has intense volcanic activity that spews particles into Jupiter’s magnetosphere. These particles create intense radiation belts and the large auroras around Jupiter’s poles.
Ganymede, Jupiter’s largest moon, also has its own magnetic field and magnetosphere – making it the only moon with one. Its weak field, nestled in Jupiter’s enormous shell, scarcely ruffles the planet’s magnetic field.
Saturn’s moon Enceladus transforms the shape of its magnetosphere. Active geysers on the moon’s south pole eject oxygen and water molecules into the space around the planet. These particles, much like Io’s volcanic emissions at Jupiter, generate the auroras around the planet’s poles. Our Cassini mission studies Saturn’s magnetic field and auroras, as well as its moon Enceladus.
Uranus’ magnetosphere wasn’t discovered until 1986 when data from Voyager 2’s flyby revealed weak, variable radio emissions. Uranus’ magnetic field and rotation axis are out of alignment by 59 degrees, unlike Earth’s, whose magnetic field and rotation axis differ by only 11 degrees. On top of that, the magnetic field axis does not go through the center of the planet, so the strength of the magnetic field varies dramatically across the surface. This misalignment also means that Uranus’ magnetotail – the part of the magnetosphere that trails away from the sun – is twisted into a long corkscrew.
Neptune’s magnetosphere is also tilted from its rotation axis, but only by 47. Just like on Uranus, Neptune’s magnetic field strength varies across the planet. This also means that auroras can be seen away from the planet’s poles – not just at high latitudes, like on Earth, Jupiter and Saturn.
Does Every Planet Have a Magnetosphere?
Neither Venus nor Mars have global magnetic fields, although the interaction of the solar wind with their atmospheres does produce what scientists call an “induced magnetosphere.” Around these planets, the atmosphere deflects the solar wind particles, causing the solar wind’s magnetic field to wrap around the planet in a shape similar to Earth’s magnetosphere.
What About Beyond Our Solar System?
Outside of our solar system, auroras, which indicate the presence of a magnetosphere, have been spotted on brown dwarfs – objects that are bigger than planets but smaller than stars.
There’s also evidence to suggest that some giant exoplanets have magnetospheres. As scientists now believe that Earth’s protective magnetosphere was essential for the development of conditions friendly to life, finding magnetospheres around exoplanets is a big step in finding habitable worlds.
The Working Dead -Department Store AU onesided Negan/Rick with tons of characters around them. (cathartic. seriously. I know it’s scary since it’s got so many characters, chapters and stuff going on and it’s onesided. but worth it.)
That’s it for now. There are other fics that I’m interested in and currently following, but I’m still waiting to see how they go and how I feel about them??? So I won’t add them here for now…
Will be constantly updating this post I guess.
Astrology is the study of
the movement of and relative positions of the planets through the Zodiac and
how they are interpreted as having an effect on people. There are two basic
systems of Astrology: Western/Tropical and Vedic. Both practice several
different branches, including Natal, Horary, Electional, Mundane, Medical,
Meteorological, and Agricultural.
Astrology is the study of the movement of and relative positions of the planets through the Zodiac and how they are interpreted as having an effect on people. There are two basic systems of Astrology: Western/Tropical and Vedic. Both practice several different branches, including Natal, Horary, Electional, Mundane, Medical, Meteorological, and Agricultural.
|| We All Live in a Pokemon World \\ Loke x Aries @softroselamb
Goldenrod City. A bustling metropolis, and the most popular tourist destination in the beautiful region of Johto. Home of the famous Normal-Type Gym, the popular Radio Tower, the Magnet Train which goes to Kanto, and the Department Store. However, Goldenrod is also home to a new trainer.
His confidence booming, he left Goldenrod to head off to New Bark Town to receive his trainer authorizations. After that, he made his way to Violet City, home of the first gym. With his partner, Cyndaquil at his side (whom he tends to call Ember, don’t ask why, it just “came to him.”) he took our Faulkner no problem at all. A grin from ear to ear on his face as he held the badge up in the air, showing it off to his partner.
“See, Ember? You’re great.” He spoke to his Pokemon, scratching it on the head and gaining a little ‘Cynda!’ in response. He figures now would be a wonderful time to explore the nearby ruins he’s heard so much about: the Ruins of Alph. Legend says they somehow have connections to a far-off land known as Sinnoh. But, Loke doesn’t believe in it. How could they connect? Sinnoh isn’t anywhere NEAR Kanto or Johto.
As Loke and his partner head for the exit to the ruins, he bumps into someone. He turns to apologize, and notices a smaller, pink haired female.
“Oh,” He paused. “I’m so sorry for bumping into you.” He glances down and notices she dropped a couple of items. He bends down and picks them up for her, noticing a Pokedex. He hands it back with a smile. “You’re a trainer?"