But there are about 1000 so-called short-period comets, whose orbits take less than 200 years.
Short-period comets, however, are mostly confined to the ecliptic the plane in which the planets themselves are found.
Short-period comets have their short periods precisely because of their interactions with closer-by planets, which are already known to astronomers.
This would make sense if short-period comets started off in the Kuiper belt and were nudged into closer orbits around the sun by the gravity of the most distant of the giant planets, Neptune.
That is some shift in consumer behaviour in a short period - and as we know other companies have rushed to imitate the iPad, though with limited impact on its market share.
Since the consequences of the latter would be manifestly detrimental to the War for the Free World, legislators opposed to the Act have offered to extend it for a short period - a gambit they hope will allow them to dumb it down still further.
This form has three types of situations (Parts A, B and C) for each short-term and long-term holding period (12 months) potentially six different Form 8949s to deal with.
If such penalties lessen the quality of the Tigers program for a 2-4 year period this could decrease short-term game-day attendances and alumni giving.
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We've still got some more work to do but we've made enormous progress in a huge -- really short period of time.
At the end of that period, if there has been no deal, the British Government will have to either suspend the assembly - even if only for a short period to give more room for manoeuvre - or call an assembly election.
The SEC's anti-naked short-selling restrictions also continue in place, including a requirement that short sales be closed out within the settlement period, with penalties on further short-selling activity if the close-out isn't followed.
The summary reflects the strong consensus evident among the participants that U.S. economic and military interests would be seriously and adversely affected should the Nation be denied the use of the Canal for a protracted period of time -- or even a relatively short period at a strategically inopportune juncture.
You know what can be cut for a short period of belt-tightening.
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So for a relatively short period of 18-24 months, the government will substitute revenue fall-out from weak oil prices with their reserve fund cash.
The Finn twice denied Michael Grabner on breakaways and made a nifty block on Frans Nielsen while the Bruins were short-handed in the first period.
Obviously now this is a company that we hope in a short period of time -- 60 to 90 days -- that emerges restructured, competitive, and without the massive debt that it previously had.
If you produce a short-term memory -- if you look up a telephone number you just remember for a short period of time (or) you meet somebody and remember their name briefly -- you have a transient change in the strength of communication.
Ilya Kovalchuk capped New Jersey's three-goal first period with his NHL-leading fourth short-handed goal, and the Devils beat the mistake-prone Philadelphia Flyers 5-2 on Wednesday night.
Mr Donoghue insisted that Alva viewed the Olympic period as a short-term loss for long-term gain.
Despite the lack of chances, the Sabres opened the scoring 7:17 into the second period with a short-handed goal.
You might have to ditch the techno-gadgets for a short period of time.
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The central bank hoisted its short-rate no less than seven times in a thirteen-month period of tightening starting October 2009 lifting the benchmark rate to 4.75%.
However in practice many users wanted to do functions like they performed using largercapacity laptop computers and in a short period of time HDD-based netbooks dominated the market.
In the first scenario of a steady, extended climb in rates, the firm found that investors would likely see the value of investments in mutual funds that hold short-term or medium-term bonds decline over a three-year period, while holders of stable-value accounts would see their balances continue to grow steadily.
The follow-up period in the new study was relatively short, they say, and breast-cancer diagnosis and treatment may be different in China compared to the United States.
For this reason, we believe that the 6-month delay in further liberalizing of these controls envisioned by the Senate resolution is simply too short a period to be a significant factor in PRC decision-making.
ScoreBig has established itself as a major player in the live-entertainment space in a short period of time.
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I've never seen this much wealth-destruction in such a short period of time.
Net tax alpha is defined as the tax reduction from short-term and long-term capital losses, less commissions, over the period beginning balance.
As I noted earlier, these systems are composed entirely of smart mines that self-destruct or self-deactivate in a relatively short period of time.
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