In that event,astronomers were able to observe the icy comet long before it struck the solar system's biggest planet.

VOA: special.2009.08.25

And when the system fails, it is my responsibility." President Obama campaigned on a promise of "change we can believe in."

VOA: special.2010.01.23

An object in the solar system could be identified if it appeared to move from its place in the earlier photograph.

VOA: special.2010.07.11

Hershey's town was modern. It had nice houses,large public buildings, and an electric railway system for easy transportation.

VOA: special.2010.12.05

The deal is not final yet, but it calls for an Islamic system of justice for the area.

VOA: special.2009.02.21

Continuing disasters in the Indian Ocean made Indonesia decide it must have a warning system of its own.

VOA: special.2009.03.17

Newer drugs attempt to suppress only one small part of the immune system, not all of it.

VOA: special.2009.04.14

The head of the center's office dealing with the nervous system said nobody else knew about it,either.

VOA: special.2010.05.04

It uses Google's Android mobile operating system and is meant to work easily with Google's Web-based services.

VOA: special.2010.01.26

It had been the first time people moved beyond their small planet into the huge solar system.

VOA: special.2009.07.29

It undermines the civilian control of the military that is at the core of our democratic system."

VOA: special.2010.06.26

Most of it,he says, could be paid for by reducing waste in the existing health care system.

VOA: special.2009.09.12

It was the name given to permanent, cloudy areas in the sky outside our solar system.

VOA: special.2009.04.29

But it is not a government operated health care system like the ones in other countries.

VOA: special.2010.03.26