That was another challenge for the astronomers: Because they didn't know the asteroid's rotation period, they didn't know when it would wax and wane, and when it would grow too faint to see.
"It's hard to imagine if they didn't know, why they didn't, " said one top American aide.
"There were a few things I think they hadn't realized or that they didn't know about, " she told Fox News.
Eureka Forbes cuts out the middleman and instead uses a team of young salespeople to give in-house product demonstrations and convince consumers of a need that they didn't know they had.
Doctors didn't understand how the polio virus entered the body, and they didn't know how to treat it.
Still, they didn't know exactly where they were.
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If fact, they didn't know an awful lot about how they spent their money every month - and in that, they're no different from the rest of us.
They didn't know which school to go to or if they were allowed to go to school while in the shelter.
"They didn't know what to think, because on paper, they were saying, 'We have to really watch this guy, '" Marsar says.
If they didn't know how Americans would react to that, what did they know?
About one-third of voters said they didn't know enough about him to make up their minds.
In the past, Pakistani officials have said they didn't know where the al Qaeda leader was.
People somehow knew that we were in this direction, they didn't know the size of it.
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They didn't know if this country was ready to move in a new direction.
Authorities said Tuesday that they didn't know whether the girls had been at the lake.
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"Many of these young people ran away because they didn't know what else to do, " she explained.
When users called to report problems, help desk staffers had to say they didn't know the cause.
Time after time, he sold people on a product they didn't know they needed until he invented it.
"We brought a toaster into a family from Africa and they didn't know what it was, " recalls Manning.
"One of the complexities for new services is people say they didn't know who to pay, " he added.
If they didn't know about the backdating, the question will be: Should they have done more to discover it?
"They didn't know I was on one engine but they knew we were in a tricky situation, " he said.
He was stealing money from the insurance people, but they didn't know it.
Around this time, the Carrs overheard a couple, whom they didn't know, arguing.
Steve Jobs was famous for giving customers features they didn't know they wanted.
"If they didn't know what was going on, how could someone else think there was even a problem, " he said.
Other residents of the apartment complex, within walking distance of the university campus, also said they didn't know Mr. Holmes.
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This group text message I had started was replied to but they didn't know that I could see the responses.
Well, they're not just trying to say Lay and Skilling are innocent, because they didn't know bad things were going on.
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