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This artist's diagram compares the Epsilon Eridani system to our own
solar system. The two systems are structured similarly, and both host
asteroids (brown), comets (blue) and planets (white dots).
Epsilon Eridani is our closest known planetary system, located about 10
light-years away in the constellation Eridanus. Its central star is a
younger, fainter version of our sun, and is about 800 million years
old—about the same age of our solar system when life first took root
on Earth.
Observations from NASA's Spitzer Space Telescope show that the system
hosts two asteroid belts, in addition to previously identified candidate
planets and an outer comet ring.
Epsilon Eridani's inner asteroid belt is located at about the same
position as ours, approximately three astronomical units from its star (an
astronomical unit is the distance between Earth and the sun.). The
system's second, denser belt lies at about the same place where Uranus
orbits in our solar system, or 20 astronomical units from the star.
In the same way that Jupiter lies just outside our asteroid belt,
shepherding its rocky debris into a ring, Epsilon Eridani is thought to
have planets orbiting near the rims of its two belts. The first of these
planets was identified in 2000 via the radial velocity technique. Called
Epsilon Eridani b, it orbits at an average distance of 3.4 astronomical
units—placing it just outside the system's inner asteroid belt.
The second planet orbiting near the rim of the outer asteroid belt at 20
astronomical units was inferred when Spitzer discovered the belt.
A third planet might orbit in Epsilon Eridani at the inner edge of its
outermost comet ring, which lies between 35 and 90 astronomical units.
This planet was first hinted at in 1998 due to observed lumpiness in the
comet ring.
The outer comet ring around Epsilon Eridani is denser than our comet ring,
called the Kuiper belt, because the system is younger. Over time, Epsilon
Eridani's ring will become wispier like the Kuiper Belt. Its comets will
collide with each other and break up, or get pushed out of the ring by the
gravitational influences of planets.