Naked Science Forum
Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: neilep on 14/10/2009 13:00:46
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Dearest Planetologists,
As a sheepy I of course luff planets. Planets are my all time favourite rocky things that support life and stuff. I luff planets, ewe luff planets..we all luff planets !
Look, here are some planets :
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Planets Congregating yesterday
nice eh ..being delivered next Tuesday !
Say one day a much bigger planet than ours with more mass and stuff, wandered by and decided that it just had to collide with us. As it got nearer, would it's gravity suck us all off our planet and deposit us upon it's surface ? say it was travelling really slow...20 mph ?...what would be the effects felt on Earth ?
whajafink ?
Hugs & shmishes
mwah mwah mwah !!
Neil
Worried About Planetary Collision
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If it went into orbit around us this could well happen, Neutron stars orbiting regular stars certainly suck of gas until they build up sufficient to cause a supernova event.
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Neilep
Have you thought to look for ISS with your new telescope, download SATSCAPE it will give you its parameters.
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Neilep
Have you thought to look for ISS with your new telescope, download SATSCAPE it will give you its parameters.
Thank ewe very Syphrum for this post and the one above .
At the moment, I am still getting to grips with my new scope ie: I am awaiting to use it !!...I would love to see the ISS and will most definitely do this. Thanks for the great suggestion.
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Have you thought to look for ISS with your new telescope, download SATSCAPE it will give you its parameters.
Check out this Youtube video @2:10 ...
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"If A Bigger Planet Was Colliding With The Earth, Would We All Get Sucked Off?"
Hugh Grant probably would.
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If Jupiter were to pass with its surface 100 miles away from ours, so as not to physically bump against our atmosphere, its gravitational attraction would act upon the occupants of Earth in a differential manner, depending on their distances to Jupiter. Occupants on the “near” side would be drawn with 2.36 g’s, the Earth itself with 1.98 g’s, and the occupants of the “far” side with 1.69 g’s. So, a 160-lb person on the near side would feel 61 lbs lighter, and the same person on the far side would feel 46 lbs lighter. Someone please check my math here.
It seems that Jupiter’s gravity would also play havoc with the oceans, atmosphere and tectonic plates, resulting in mountainous high tides on the near and far sides and abyss-mal low tides elsewhere, and everywhere there would be horrific winds, earthquakes, and volcanic eruptions as well as destruction of the North Pole’s ice cap, California sliding in the ocean (of course), etc. You can probably throw in hurricanes, tornados, lightning and massive forest fires as well. The atmosphere would fill with smoke from various sources, which would severely hamper photosynthesis, resulting in massive crop failures and the end of large-scale food production, including meat. Yeah, pretty much the end of life on Earth as we know it.
Although, yeasts could survive and flourish, so we’d still have our Vegemite --- that’s a relief.
Jupiter’s effect on Earth could only be very transient because it could not simply “hover” in close proximity to Earth, but could only make a quick pass. It would also throw Earth out of it’s current orbit around the Sun (changing our 365.256-day year) and change its rotation (changing our 24-hour day). Clocks and calendars would become meaningless ... but we'd still have our Vegemite.
Thank ewe DiscoverDave for your wonderful answer. I really hope Jupiter decides to stay where it is for now as a collision with it could really ruin everybody's day. Ewe mentioned that it would disrupt our orbit around the Sun. Could it also possibly turn the Earth into one of it's satellites ?..whajafink ?......Of course being a Brit...it pleases me that it's Marmite that we'd still have ! [;)]
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"If A Bigger Planet Was Colliding With The Earth, Would We All Get Sucked Off?"
Hugh Grant probably would.
How rood !! [;)]
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Have you thought to look for ISS with your new telescope, download SATSCAPE it will give you its parameters.
Fantastic video RD..thank ewe .
Check out this Youtube video @2:10 ...
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If Jupiter were to pass with its surface 100 miles away ... pretty much the end of life on Earth as we know it. ... but we'd still have our Vegemite.
Thank ewe DiscoverDave for your wonderful answer. I really hope Jupiter decides to stay where it is for now as a collision with it could really ruin everybody's day. Ewe mentioned that it would disrupt our orbit around the Sun. Could it also possibly turn the Earth into one of it's satellites ?..whajafink ?......Of course being a Brit...it pleases me that it's Marmite that we'd still have ! [;)]
Well, I suppose it could. Then we'd be so far away, we'd all freeze to death ... but we'd have our Vegemite (and Marmite in UK ... and US). [;D]
Wow, I tell you what -- that stuff is a taste to be acquired unless you mix it with peanut butter. BTW, what do you call peanut butter in the UK, because you guys don't call them "peanuts" do you?
Thank ewe DiscoverDave
However, if Jupiter adopted Earths orbit around the sun then all might be swell ...wouldn't it ? !!
Erhmm..we do call them peanuts and certainly call it peanut butter but it's worth pointing out that Marmite and Vegemite are two separate beasts. Marmite is altogether a far superior product [;D]than Vegemite !..vegemite of course has it's heritage in Ors-strayy-lee-urr whereas Marmite is a native British product of infinite superiority http://www.marmite.co.uk/enter.html [;D]
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What a fascinating topic!!
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If Jupiter were to pass with its surface 100 miles away from ours, so as not to physically bump against our atmosphere, its gravitational attraction would act upon the occupants of Earth in a differential manner, depending on their distances to Jupiter. Occupants on the “near” side would be drawn with 2.36 g’s, the Earth itself with 1.98 g’s, and the occupants of the “far” side with 1.69 g’s. So, a 160-lb person on the near side would feel 61 lbs lighter, and the same person on the far side would feel 46 lbs lighter. Someone please check my math here.
Hmm... I get 2.526g 100km above Jupiter (Wikipedia reckons it's 2.528g at the surface, but that extra 100km doesn't add up to the difference) and 1.821g 12712.1 km above Jupiter i.e. on the other side of the Earth.
People facing Jupiter will experience Earth's g - Jupiter's g, but the people on the far side of Earth will experience Earth's g + Jupiter's g...
So I get -1.526g relative to Earth for the people facing Jupiter, and +2.821g for people on the far side.
I get a figure of 2.131g acting upon the Earth i.e. at it's center.
My maths probably needs checking too [;)]
In practice though, with that sort of gradient, I think the Earth would have pulled itself apart.
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If Jupiter were to pass with its surface 100 miles away from ours, so as not to physically bump against our atmosphere, its gravitational attraction would act upon the occupants of Earth in a differential manner, depending on their distances to Jupiter. Occupants on the “near” side would be drawn with 2.36 g’s, the Earth itself with 1.98 g’s, and the occupants of the “far” side with 1.69 g’s. So, a 160-lb person on the near side would feel 61 lbs lighter, and the same person on the far side would feel 46 lbs lighter. Someone please check my math here.
Hmm... I get 2.526g 100km above Jupiter (Wikipedia reckons it's 2.528g at the surface, but that extra 100km doesn't add up to the difference) and 1.821g 12712.1 km above Jupiter i.e. on the other side of the Earth.
People facing Jupiter will experience Earth's g - Jupiter's g, but the people on the far side of Earth will experience Earth's g + Jupiter's g...
So I get -1.526g relative to Earth for the people facing Jupiter, and +2.821g for people on the far side.
I get a figure of 2.131g acting upon the Earth i.e. at it's center.
My maths probably needs checking too [;)]
In practice though, with that sort of gradient, I think the Earth would have pulled itself apart.
Could it be because DiscoverDave said 100miles and ewe calculated for 100 kilometeres LeeE ?
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Oops! - but what an earth is he doing talking in terms of miles? Ah yes, he's an American, and they still use 'Imperial' measures over there [;)]
The overall effect though, will be to only reduce Jupiter's gravitational effect by a little bit - perhaps at the third decimal place.
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Akchewerly DiscoverDave, as long as the two planets remain separated and don't overlap they can be treated as point objects. The only real complicating issues are that the atmospheres of both planets extend well beyond 100 miles and we should decide whether we want to take relativistic effects in to consideration.
As it's not a realistic scenario though, and the question doesn't require such accuracy, I think we can ignore these factors.
I've often wondered how the difference in English and U.S. volume measures i.e. gallon, quart etc. came into being? I can't help thinking that something underhand was going on there and what was originally a short-measure eventually became the norm. Heh, imagine what it would have been like if we'd have ended up with different yards, feet and inches etc. [:D]
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I've often wondered how the difference in English and U.S. volume measures i.e. gallon, quart etc. came into being? I can't help thinking that something underhand was going on there and what was originally a short-measure eventually became the norm. Heh, imagine what it would have been like if we'd have ended up with different yards, feet and inches etc. [:D]
I've often wondered about the fluid measure difference, and I came a similar conclusion. Somebody was getting ripped off! I might also have been something to do with taxes, but it seems to be going in the wrong direction for that.
There is also the Long Ton (2048 lbs) and the Short Ton (2000 lbs) and there are also Long and Short Hundredweights.
Mind you, I still think it's handy to be able to buy 2" by 4" lumber (which was 4" by 2" in the UK) even if it is actually only 1.5" by 3.5".
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I found out recently that the French used to have a 27.6 mm inch I wonder if they still have it in Quebec ?.
About left and right driving I think it is about 50/50, when you go across one bridge from Afganistan to Pakistan you have to change over half way across.
There are ten regions in Europe including one in France with left hand driving, can you name them ?.
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I've heard that American horse races run in the opposite direction that British races because the Americans wanted to be different than the British. Maybe that's why we drive on the wrong side of the car on the wrong side of the road.
Heh, so it's just out of cussedness then [:D]
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"If A Bigger Planet Was Colliding With The Earth, Would We All Get Sucked Off?"
Hugh Grant probably would.
Now I said something along those lines, but I thought it bit too roooood to put on the forum, so I PM'ed it to our sucking sheepy.
Pheew! Glad I spelled that right!
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"If A Bigger Planet Was Colliding With The Earth, Would We All Get Sucked Off?"
Hugh Grant probably would.
Indeed, and he'd probably comment in the process that such magnificent close up views of Jupiter are "Divine"...
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"If A Bigger Planet Was Colliding With The Earth, Would We All Get Sucked Off?"
Hugh Grant probably would.
Indeed, and he'd probably comment in the process that such magnificent close up views of Jupiter are "Divine"...
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fbestsmileys.com%2Fsigns16%2F6.gif&hash=d8669bf7688a4da7920dc3dcc803e74c)(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fbestsmileys.com%2Fsigns4%2F7.gif&hash=7fcce476cb2c8c7af42e44185894434b)
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I heard that, years ago, one of the Scandinavian countries switch from left-side to right-side driving at midnight New Year's Eve. Does anyone know how true this is?
Yes, it's true. It was Sweden, about fifty years ago. I seem to remember they banned all traffic for a day while they did the switch over.
(Fooled you Neil - bet you thought I was going to make another smutty remark about Huge Grant)
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Gravitational force decreases as to the square of the distance. Accordingly, a planet four times the mass of earth would neutralize the earths gravity at a place where its center was two times the distance from you as you are from the distance of your own center.
Assuming the density/size of the two planets are roughly equal, you will obtain weightessness at about the same time the two planets collided just over you jacuzzi.