User talk:Krista gronifillo

the thousands galaxies,stars and planets that are visible from earth are some of the billions of objects that make up the universe and how it change with time

stars and plAnets have been studied since the first humans looked up the sky.they made sense of the bright dots they saw by grouping them into constilations.they developeed a simple model of the universe.more recently,scientisthave studied what stars are made of and how they form,evolve and die.mostvscientist bilieve the universe was born in big bang an instant when. all matter was created and time began.

almost all the object in the universe are too far away for missions from earth to visits.astronomers use telescope on earth and in orbit to gather information from the light,x-ray,radio and infarred radiation given out by such distant and asteroids, and twelve men have walked on the moon.each year,astronomers and space scientists discover more objects in space and learn new details about those objects that have already been known for some time.