Another Space-Time? - Pulsars Ticking and blinking like a cosmic metronome, pulsars keep far better time than the most accurate ordinary clock, and anyone can see the beam of this cosmic lighthouse flash once each rotation of any planet (astronomers wonder how the sky would look...See more

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More from Jorge_Saint_Just

Buying Your First Scope A telescope need not have high magnifying power or be expensive to allow you to see every planet in the solar system. It is the size of the lens aperture and the instrument’s portability that count. John Shibley, an editor at Astronomy magazine and author...See more

Star Gazer’s Guide Stars and Constellations The Explosion that created the Universe gave birth to trillions of stars, but only 5,000 are visible to the naked eye. Since only half the sky can be seen at any one time, that means only 2,500 stars will be in your field of vision on...See more

Planets of the Solar System There are eight planets in the solar system, including Earth, but only four besides our own are visible to the naked eye: Venus, Mars, Jupiter, and Saturn. Mercury: The smallest of the planets is Mercury. Its diameter is less than half the...See more

More from Jorge_Saint_Just

Buying Your First Scope A telescope need not have high magnifying power or be expensive to allow you to see every planet in the solar system. It is the size of the lens aperture and the instrument’s portability that count. John Shibley, an editor at Astronomy magazine and author...See more

Star Gazer’s Guide Stars and Constellations The Explosion that created the Universe gave birth to trillions of stars, but only 5,000 are visible to the naked eye. Since only half the sky can be seen at any one time, that means only 2,500 stars will be in your field of vision on...See more

Planets of the Solar System There are eight planets in the solar system, including Earth, but only four besides our own are visible to the naked eye: Venus, Mars, Jupiter, and Saturn. Mercury: The smallest of the planets is Mercury. Its diameter is less than half the...See more