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Description
As of today, we are still sending messages to the stars: messages that, so far, have not been answered. For more than 50 years, we've been unsuccessfully searching for any evidence of intelligent extraterrestrial life. But, the discovery of thousands of exoplanets has meant the hope of finding them is higher than ever. First contact with alien intelligence will become a reality in the future, so we must understand how to communicate. What kind of...
Description
In 1969, Neil Armstrong stepped onto the lunar surface and into the history books as the first of only twelve men to walk on the Moon. But in 1961 when Kennedy pledged to put a man on the Moon, NASA had barely put a man into orbit. They had less than 10 years to train a team of astronauts to overcome the unknown challenges of a mission to the Moon.
11) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Episode 7The Celestial Sphere
Description
As Earth rotates on its axis and orbits the Sun, the night sky changes over a 24-hour period, as well as throughout the year. This lecture explains how to locate celestial bodies and why the sky appears different from place to place.
13) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Episode 21The Colors of Stars
Description
The surface temperature of a star determines its apparent color. The hottest stars are bluish in color, and the coldest stars are reddish; stars at intermediate temperatures appear white. The Sun is a white star.
20) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Episode 23Modern Telescopes
Description
Today's telescopes are designed to provide huge light-gathering mirrors at relatively low cost. The mirrors focus light from distant objects onto sensitive electronic detectors that are far more efficient than traditional photographic film.
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