1. Eris is quite small.
2. Eris is very far away!
a long time
No. Approximately 6000 stars can be seen with the naked eye, but there are many trillions of star out there that we can NOT see with the naked eye. Even the closest star after the Sun - Proxima Centauri - can't be seen without telescopes.
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It varies. See this thread.http://board.alluc.org/viewtopic.php?id=29001
Millimeter wavelengths are short frequency radio waves astronomers use because they can see gases and other phenomena not visible in visible light. MM wavelengths are usually used where the air is dry so water vapor can't scatter the waves.
Eris was discovered in the Kuiper Belt, a region of the outer solar system beyond Neptune. It was first observed in January 2005 by a team of astronomers led by Mike Brown at the Palomar Observatory in California. Eris is a dwarf planet with a highly elliptical orbit that takes it far from the Sun.
Yes. While the sun is much dimmer when view from Eris, it is still brighter than any other star.
Astrologers look at stars and predict events according to what they see. They are different from astronomers because astronomers have a scientific basis, while astronomers do not.
1995
Eris is located in the what is known as the scattered disk, beyond the kyper belt. Ceres is the only dwarf Planet in the asteroid belt. See related question.
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Eris is located in the what is known as the scattered disk, beyond the kyper belt. Ceres is the only dwarf Planet in the asteroid belt. See related question.
No, Eris isn't a planet, it is a dwarf planet. See the related question "What is a dwarf planet?" for more details on the differences. Eris is the largest known dwarf planet in the solar system and the ninth-largest body known to orbit the sun directly. No Iris is a satellite.
6months
A Telescope
Through the Spitzer Telescope
Eris can be seen in a telescope when it is at its closest approach to Earth, typically during opposition when it is opposite the Sun in the sky. Eris is located in the outer solar system in the Kuiper Belt, so it is quite small and faint, requiring a large telescope and dark skies to observe.