50 Years Later, Astronaut John Glenn Recounts His Historic Mission in Space…
A team of Canadian scientists have discovered a "Trojan" asteroid that is caught in a synchronized orbit with the Earth. Jeffrey Brown discusses what this discovery means with the California Institute of Technology's Mike Brown.
Scientists and stargazers alike have long been fascinated by the auroras, also known as the northern and southern lights -- the bands of light that stretch and sometimes dance across the night sky near the earth's poles.
By PBS NewsHour
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