NEAR EARTH
The Moon
Hubble Telescope
Meteors
THE SOLAR SYSTEM
The Sun
Mercury
Venus
Mars
Deimos
Phobos
Jupiter
Europa
Io
Saturn
Uranus
Neptune
Pluto
ASTEROIDS:
Eros
Gaspra
Vestra
COMETS:
Hale-Bopp
Halley
Hyakutake
West
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Io is one of the most unusual moons in our solar system. There are active volcanoes constantly erupting, due to heating of the satellite by gravitational tides caused by nearby moons Europa and Ganymede.
The temperature is -143° C., with warmer areas near volcanoes.
Io is composed primarily of rock with very little iron. Io acts as an electrical generator as it moves through Jupiter's magnetic field, developing 400,000 volts across its diameter, and generating an electric current of 3 million amperes that flows along the magnetic field to the planet's ionosphere.
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STARS
A Star is Born
Death of a Star
Supergiants
Neutron Stars
Pulsars
A Planet Beyond
NEBULAE
A Nebula
Nebula 2366
Nebula 604
GALAXIES
Center of Our Galaxy
Dust Lanes
Andromeda (M31)
M 100
M 51
M 83
Irregular Galaxy
THE UNUSUAL
Gravitational Lens
Black Hole Galaxy
Clusters of Galaxies
Colliding Galaxies
Quasars
Supernova Remnant
Black Hole
Navigate Our Galaxy
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