In the study, scientists placed highly sensitive measuring equipment two hundred to two hundred seventy meters under the ocean's surface.

VOA: special.2009.07.07

Scientists have long believed that Earth's satellite lacks the ability to hold water near its surface because it has no atmosphere.

VOA: special.2009.09.30

One argument against the comet theory is that a comet would have left a large hole in the Earth's surface.

VOA: special.2009.01.20

The researchers say the report offers evidence that one or more comets were responsible for a sudden cooling period on Earth's surface.

VOA: special.2009.01.20

Scientists said the glass came from material created as deep as three hundred kilometers below the moon's surface.

VOA: special.2009.07.29

But California officials recently registered objects left by the first men to land on the moons surface.

VOA: special.2010.03.02

But another NASA project, the Lunar Crater Observing and Sensing Satellite,or LCROSS, could provide answers to what lies deeper beneath the moon's surface.

VOA: special.2009.09.30

It carried oxygen,water, electricity and food for two men for two days on the moon's surface.

VOA: special.2009.07.22

When this happens, one plate moves past the other, suddenly causing the Earth's surface to split.

VOA: special.2010.01.12

With such a vehicle, astronauts could explore a much larger area of the moon's surface.

VOA: special.2009.07.29

Most maps of the world show lines that are not on the Earth's surface.

VOA: special.2010.07.14

This forces apart pieces of the Earth's surface in a violent earthquake.

VOA: special.2011.01.04

Scientists measure solar activity by counting dark areas on the sun's surface.

VOA: special.2009.09.29

The stage itself becomes the ship's surface with sails and rigging.

VOA: special.2010.06.11