what year did the crab nebula form?
404738
In 1094 AD, a  supernova, clearly visible in daylight, was witnessed and recorded in China and India, and the result of it can now be seen in space as the luminous Crab Nebula, measuring 10 light years wide and being lit by the Crab Pulsar in the center. At 9.7 kilometres wide, it rotates 33 times per second and has an extremely strong magnetic field. This magnetic field constantly hurls particles out of the inner part of the nebula and into the larger cloudlike part.
488135
A little over 4.35 light years.
1081187
A nebula (Latin: "mist"; pl. nebulae or nebulæ, with ligature) is an interstellar cloud of dust, gas and plasma. Originally nebula was a general name for any extended astronomical object, including galaxies beyond the Milky Way (some examples of the older usage survive; for example, the Andromeda Galaxy is sometimes referred to as the Andromeda Nebula).
1042191
Is this it Odin: Photon Space Sailer Starlight (NTSC)  It was from 1985.\n\nhttp://www.amazon.co.uk/exec/obidos/ASIN/B00000I1SD/202-2551280-5455006
1032453
Try Googling "Ancient Egyptian Astronomy". If you're looking for stuff that old, it may be hard to find. That's prehistory, so it's either unrecorded or still in translation - if they've uncovered anything on the subject.\n\nYou might also try National Geographic's website, and perhaps your local science museum may have something as well.
272482
When the Sun was born. ;)  4.6 billion years ago.
640490
Up until the time that the earth started forming, the sun had time (I can't speculate, but probably a few billion years) to begin it's nuclear fusion and begin burning. Sol would have been surrounded by thick clouds of dust, ice and gases (see planetary nebulae). The particles of gas and dust began to clump together into larger and larger pieces and began spinning around the sun either falling in their maintainable orbits or falling back into the sun. These clumps continued to come together and the planets were formed in their respective distances around the sun.
662166
A longish answer I picked up from the source link in reply to question 26 on the page. I'm quoting it verbatim herebelow\n\nQuote"\nBecause whatever it arose from--probably a cloud of gas and dust--was rotating to begin with.\n\nThe thing to keep in mind that even a very slow rotation of a cloud of objects gets greatly speeded up as it condenses at the center. The reason is a basic law (a consequence of Newton's laws of motion) by which a quantity known as ANGULAR MOMENTUM (or rotational momentum) is conserved. The angular momentum can be defined as the average radial distance, TIMES the average velocity of motion, TIMES the mass.\n\nThe mass does not change when matter collects near the axis of rotation, so we neglect the last part. Then, if the material collectes in the middle, where its average radius of rotation is 10, 100 or 1000 times smaller, the average velocity of its particles increases by the same factor.\n\nYou see this happen every day. When water drains from a filled bathroom sink, even if the water in the sink is rotating so slowly that you do not notice, by the time it reaches the drain it is spinning rapidly enough to form a funnel. (It does not spin in the opposite direction in Australia: the effect on which this claim is based is far too weak to have much effect. See "Stargazers," section 24). You also see this in hurricanes and tornadoes.\n\nAnd you see it happen when a large object in space collapses. In 1054 a star "went supernova" in the constellation of the Crab, a process in which the top layers blow off and the core collapses to a tiny "neutron star," perhaps 15 km across and as massive as the Sun. The collapsed core of the Crab Nebula apparently rotates 30 times a second, because that is the frequency at which it blinks in x-rays and radio (and I believe in its light, too).\n\nIn the solar system all planets orbit in the same direction and nearly in the same plane, and they and the Sun rotate in the same direction too (= counterclockwise, viewed from north). This suggests that they all condensed from the same cloud."   Unquote
112629
Very roughly 2 billion years ago.  But you should be aware of two points. \n\nThe first is that the date is a matter of considerable debate and it could easily be half a billion years either side of that.\n\nThe second is that the transition was extremely slow, starting with the addition of oxygen by inorganic processes and then taking a massive leap with the evolution of oxygen producing autotrophs.
493652
Planetary nebula are formed after a supernova explosion.\n The remains of a giant star that has consumed its fuel.
993258
The Earth was formed around 4.57 billion (4.57×109)[1] years ago
569095
march 29, 2006\nhttp://www.exploratorium.edu/eclipse/2006/
215254
No. Our sun is just a plain, average G2 V type dwarf. \n\nPulsars are neutronstars that send out strong radiopulses as they rotate. They were first tought to be radio beacons from some alien civilization because of the regularity of the pulse. The first one observed had a period of 1.337011 seconds. Only a neutronstar can rotate that fast. As a massive star explodes in a supernova its core collapses. As it does so it spins faster and faster like a figure skater pulling her arms in. A stellar core goes from earth size to the size of a city. \n\nWhen scientists detected a pulsar within the Crab nebula, where a supernova had obviously gone off, it was confirmed that pulstars are in fact neutronstars.
300263
Our sun began forming within an immense interstellar cloud of drifting gas and dust. Inside this cloud (called a 'nebula') were regions of relatively high density where gravity began drawing together bits and pieces of the gas and dust. Over several million years, this spherical region became denser and denser which caused its central temperature to rise. Finally, some 4.5-billion years ago, the temperature was hot enough to start nuclear fusion. Our sun was born.\n\nGod should be spelled B-I-G B-A-N-G\nPBrax@netscape.com
263032
(13.7 +/- 0.2) billion years, according to the most recent data from the WMAP probe, studying cosmic background radiation
395085
yeh, a meteorit and a galaxy are coming to earth. Don't worry, they come only after 2 milion years...;))
13009
Current scientific knowledge postulates that the first stars have formed as early as 13 billion years ago (the age of the Universe is estimated at 13.6 billion years). Those early stars consisted of only hydrogen, helium and a little bit of lithium, since all heavier ellements were formed only inside stars. Most of these ancient stars were also very massive (somewhat 100 times heftier than our Sun).