51.   A planet must make one whole orbit of its star before astronomers can be certain of its characteristics.

52.   As a result, astronomers have been unable to get a clear picture of the center using ordinary telescopes.

53.   Astronomers are able to predict total eclipses of the sun like the one visible Thursday in southern Africa.

54.   Astronomer would have been proud of telescope that bears his name.

55.   Astronomers were not the only people intrigued by the eclipse.

56.   Astronomers also are concerned about a plan before the council to replace some hooded streetlights with decorative acorn-shaped lamps in various historic districts.

57.   Astronomers everywhere will be able to use the Hipparcos Catalog to explore fundamental questions like how and when the universe was born and how it behaves.

58.   Astronomers nonetheless are thrilled to have so much observing time.

59.   By using the quasar as a light bulb, astronomers should be able to detect whether anything is blocking that ultraviolet light on its way to Earth.

60.   By studying these stellar remnants, he said, astronomers should be able to learn more about galaxy formation.