But there are about 1000 so-called short-period comets, whose orbits take less than 200 years.
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.
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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During the scheme, intensive support will be provided to 3, 000 short-term prisoners over a six-year period, both inside prison and after release.
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.
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.
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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For instance, the official position on short-term capital inflows to financially fragile countries is merely to allow holding-period taxes, not to encourage them.
It is also unlikely that the European Central Bank - which needs to rubber stamp any changes to central banks within nations sharing the euro - will agree to a short handover period for Mr Fazio.
Because the energy flow is not just non-constant but also erratic, the back-up systems also need to be extremely sensitive and capable of ramping up from shut-down to fully-on within a very short period of time to prevent grid instability and even collapse.
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Henrique put the Devils up 2-1 with a short-handed goal 1:21 into the period.
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