Doppler-shifted stellar spectrum and physics calculations that indicate a low-mass object
maybe because they have found more than 300 planets outside our solar system. But they all have been gas balls or can't be proven to be solid. Now a team of European astronomers has confirmed the first rocky extrasolar planet. so i think they think that it is interesting that it is the first rocky extrasolar planet.
An asteroid
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There is no proof of that, however statistics suggest that it is almost entirely certain that it exists- the possibility of a planet to house life is very small, however there are many planets (pentillions of them) in our universe, and that small chance multiplied by that number gives us good chances of life elsewhere.
You might be thinking of Pluto, a dwarf planet, orbits the sun every 247.68 years. Pluto, however, is not a planet.
Oxygen-rich atmosphere and liquid water.
No. Jupiter is a gas planet. It has no surface on which volcanoes might form.
A city council's proposal recordsA petition and letter to your congressional representative
I might not be a planet . .
maybe because they have found more than 300 planets outside our solar system. But they all have been gas balls or can't be proven to be solid. Now a team of European astronomers has confirmed the first rocky extrasolar planet. so i think they think that it is interesting that it is the first rocky extrasolar planet.
Scientists have uncovered evidence that there might be a ninth planet roughly ten times the mass of Earth somewhere in the dark, outer reaches of the solar system, on an orbit that takes 10,000 to 20,000 years. So far the only evidence is a pattern in the orbits of several Pluto-like objects which may be a result of this planet's gravity. Scientists will try to determine if this planet actually exists, but the search will probably take years.
The evidence might be unreliable because technology and other knowledge has advanced since that time, and their evidence might have been biased.
No. Mars has a similar rotational period but not revolution. For a planet to have the same revolution period as Earth would mean it would have to be in the same Orbit as Earth, with catastrophic results. One was in the same orbit as Earth during it's formation, it crashed into the Earth creating the Moon. It's possible that some extrasolar planet (that is, a planet of a star other than the Sun) might by coincidence have nearly the same rotational and/or revolution period, but we don't know of any yet (and it's not very likely that we ever will).
The existence of planet Nibiru is largely rejected by scientists as based on false claims, conjecture, mistranslations, flawed techniques, and general lack of good supporting evidence; hence, scientists might be able to only destroy it notionally through refutation.
Ceres is not yet determined as a planet, just like Pluto it might not be a regular planet.
Direct evidence are visible noticable changes. Indirect evidence is when you might not see the action happen but you do notice the results
Not yet. Scientists have discovered evidence that a large planet roughly 10 times the mass of Earth might exist far beyond the orbits of the other planets. So far we have not proven its existence. We may have to wait until the year 2020 before we find it.