Recent comments in /f/space

space-ModTeam t1_j979kxr wrote

Hello u/Consistent-Sweet-119, your submission "Where does the asteroid belt belong?" has been removed from r/space because:

  • Such questions should be asked in the "All space questions" thread stickied at the top of the sub.

Please read the rules in the sidebar and check r/space for duplicate submissions before posting. If you have any questions about this removal please message the r/space moderators. Thank you.

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7sv3n7 t1_j977191 wrote

The inner Solar System includes the four terrestrial planets and the asteroid belt. The outer Solar System is beyond the asteroids, including the four giant planets. Since the discovery of the Kuiper belt, the outermost parts of the Solar System are considered a distinct region consisting of the objects beyond Neptune.

From Google not my words but hope it helps

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A_Sane_Human_Being t1_j976tj0 wrote

There is no “Inner” and “Outer” solar system with a hard defined boundary. Generally the solar system is divided into the rocky planets (which ends at Mars), the gas giants (which starts at Jupiter), and the Kuiper Belt (which is all of the objects beyond the orbit of Neptune).

So you would just say the asteroid belt is the region of space between the rocky planets and the gas giants, or between Mars and Jupiter. There is no real agreement in what the “inner” and “outer” solar system is or if they are even fair classifications. Especially now that the Kuiper Belt is so frequently referred to as the outer solar system by laymen.

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rocketsocks t1_j976b13 wrote

Erosion, water and the atmosphere. The atmosphere protects the surface from some impacts, causing a larger number of small sized impactors to blow up in the air before reaching the surface and forming a crater. A similar effect happens with smaller impactors that hit the ocean and aren't large enough to make a crater in the ocean floor. The big factor though is erosion and plate tectonics. If you look at the surface of Mars most of that crust is ancient, billions of years old. On Earth the crust gets recycled constantly due to tectonics and volcanism. The big island of Hawai'i is a fraction of a million years old, for example, and the ocean floor keeps getting recycled in a process that keeps most of it under 150 million years old.

Then you have erosional processes due to the air, the water cycle, life, etc. Mountains get worn down, surface features get changed by rivers and shorelines, rocks get changed and moved around, life covers up or erodes surface features, etc. There's a huge crater in the Yucatan peninsula from the impactor that ended the reign of the dinosaurs 66 million years ago, but it's not easily visible to the naked eye because of all the erosional processes that have occurred since then. Remnants of older craters have been found but they are also not easily visible because of erosion. Smaller craters have a tendency to get completely erased by geological activity and erosion.

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kerfitten1234 t1_j970pm4 wrote

Lol, your source is an opinion piece meant for kids.

https://www.britannica.com/science/meteorite-crater/The-impact-cratering-process

>Earth’s atmosphere certainly slows and prevents typical asteroidal fragments up to a few tens of metres across from reaching the surface and forming a true hypervelocity impact crater, but kilometre-scale objects of the kind that created the smallest telescopically visible craters on the Moon are not significantly slowed by Earth’s atmosphere...

The atmosphere shielding the surface is not the reason for that lack of craters on earth.

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ArmChairAnalyst86 t1_j96yl9j wrote

I agree overall. X Class flares of this variety occur fairly frequently. There's a bit too much sensationalism about these flares. That said, a direct hit from even a lower X class flare could have implications for earth and satellites but likely minor in nature.

In 89' an X15 and resulting CME hit earth. Aurora made it south as Texas and Quebec lost their grid for several hours. Communications were affected worldwide. It was still just a love tap, despite being a moderately strong storm. I understand that there are several factors that influence the magnitude of resulting geomagnetic storms but the 89 event does provide a decent frame of reference for strength of flare and resulting storm/effects on earth.

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CrimsonWolfSage t1_j96we2r wrote

1986 was the last Halleys comet, and it won't be back until 2061. So, while this is a very popular name thrown around. Most younger adults have never even seen it!

Might see if these help ring a bell for you

  • 1997 - hale-bopp
  • 1996 - comet Hyakutake
  • 1994 - Shoemaker (struck Jupiter - too old here)
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kerfitten1234 t1_j96w8e9 wrote

Mars is a cold desert, like Antarctica. Also mars' atmosphere is too thin to allow water to exist in liquid form on the surface, except in special circumstances.

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kerfitten1234 t1_j96viy6 wrote

No, it's because of erosion and the fact that earth is tectonically active. Any meteor large enough to leave a decent crater isn't going to be stopped by an atmosphere.

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