The idea is that the matter we see does not have enough gravitational pull to keep galaxies together.

VOA: special.2009.07.21

Helen was on the floor, kicking and screaming and trying to pull the chair out from under me.

VOA: special.2009.11.08

News reports said Adair used about three hundred forty kilograms of nitroglycerine explosive material to pull the oxygen out of the fire.

VOA: special.2009.03.22

But carrots loose their sweetness if you wait too long to pull them from the ground.

VOA: special.2009.02.24

the sharp sounds of leather whips, ordering the dogs to move and pull the sleds.

VOA: special.2010.02.27

Climbers have to pull themselves straight up the face of very high rocks or walls.

VOA: special.2009.12.09

"They are seeking," he said, "to pull down the temple of freedom and representative government."

VOA: special.2010.09.09

I was getting angry. In fact, I was ready to pull my hair out.

VOA: special.2009.05.03

They try not to pull themselves up with their hands or arms.

VOA: special.2009.12.09

Robert E.Lee needed those roads to pull his army together quickly.

VOA: special.2009.11.05

I am not trying to pull a fast one on you.

VOA: special.2009.07.19

the red god of war. It seemed to pull me near.

VOA: special.2010.07.10

He was trying to pull them out of the granite wall.

VOA: special.2009.02.07

He urged the Senate not to pull down the American flag.

VOA: special.2010.07.22