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

Mars Day at the Smithsonian Air and Space Museum in Washington is a celebration of our solar system's most famous planet.

VOA: special.2010.07.28

But last month,a computer programmer from Australia made an exciting discovery of an unusual event in Earth's solar system.

VOA: special.2009.08.25

His idea started when he heard two religious workers playing music for free in New York City's underground transportation system.

VOA: special.2009.07.31

Microfinance provides poor people with a way to build savings and work toward becoming part of a country's official financial system.

VOA: special.2010.06.16

A recent report shows that the small organ has a much more important job in the body's defense system than once believed.

VOA: special.2009.08.25

The goal of the Stardust-NExT spacecraft is to gather scientific evidence about one of the solar system's most changeable objects -- comets.

VOA: special.2011.02.09

They found that TGF-beta helps to heal wounds and is important in the body's defense system against disease.

VOA: special.2009.01.27

This most recent collision with Jupiter brought attention to how the huge planet's gravity affects our solar system.

VOA: special.2009.08.25

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

On his twenty-fourth birthday, doctors told Onalfo he had non-Hodgkin's lymphoma, a cancer of the immune system.

VOA: special.2010.06.02

C.D.C. official Janet Collins says breathing secondhand smoke has immediate harmful effects on a person's heart-and-lung system.

VOA: special.2009.01.07

MS symptoms can depend on where the nerve scars are in the body's central nervous system.

VOA: special.2009.01.06

Doctors can only hope that a person's defense system is strong enough to fight the disease.

VOA: special.2009.05.26