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441) 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.
448) 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.
450) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Episode 28Mercury and Venus
Description
Though broadly similar to Earth, Mercury and Venus differ in detail. Mercury has a negligible atmosphere and is heavily cratered. Venus has an incredibly thick atmosphere and suffers from an extreme greenhouse effect that makes it intensely hot.
451) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Episode 11More Eclipse Tales
Description
Solar eclipses also come in annular and hybrid varieties, reflecting the varying distance of the Moon from Earth. A famous total solar eclipse in 1919 provided observational evidence for Einstein's general theory of relativity.
456) Understanding the Universe: An Introduction to Astronomy, 2nd Edition: Episode 31Magnificent Saturn
Description
Best known for its extensive ring system, Saturn has come into focus recently thanks to the Cassini spacecraft, which landed a probe on Saturn's largest moon, Titan; and also discovered evidence of liquid water on the moon Enceladus.
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