Much of the information came from observations made by thousands of volunteers in more than four thousand places over forty years.

VOA: special.2009.05.12

Mister Tombaugh got a job at Lowell Observatory after he sent drawings of his observations of Jupiter and Mars.

VOA: special.2010.07.11

In his first observations from Mount Wilson, Hubble used a telescope with a mirror one hundred fifty-two centimeters across.

VOA: special.2009.04.29

By nineteen twenty-five, he had made enough observations to say that the universe is organized into galaxies of many shapes and sizes.

VOA: special.2009.04.29

But those observations were made years ago and NASA scientists had not trusted the results without clear confirmation.

VOA: special.2009.09.30

Darwin's observations showed him that environments can change a little very quickly and a great deal over time.

VOA: special.2009.02.27

He wrote that Miz Mead made her observations from just a few talks with two friendly young women.

VOA: special.2010.01.17

Recent observations had suggested that 2 of the 4 spiral arms hold most of the older stars in the Milky Way galaxy.

VOA: special.2009.01.20

They appear blue. Observations of forty-six galaxies showed Hubble that the galaxies were traveling away from Earth.

VOA: special.2009.04.29

His works include observations about current political struggles, the fear of diseases, and the popular language of the city's tradesmen and other professionals.

VOA: special.2010.01.13

The observations also showed that the speed was linked directly to the galaxies' distance from Earth.

VOA: special.2009.04.29

Scientists say extensive observations from earth-based telescopes are needed to confirm the existence of the planets.

VOA: special.2011.02.09

It tells about a sailor named Ishmael and his observations on the whaling ship Pequod.

VOA: special.2010.06.11

The story begins with the daily observations of a young English lawyer named Jonathan Harker.

VOA: special.2010.01.20