New planets are not forming in our solar system. When you get beyond Neptune, there is large grouping of stellar debris called the Kuiper Belt. The Kuiper Belt has enough material to become another planet, but it orbits around the sun too slowly for the material to combine. The planets formed by having asteroid-like rocks collide with one another, and the objects in the Kuiper Belt are spread out too far and don't have enough moment to form anything.
There may be new planets forming around different stars. So far there have been around 800 stars found to have planets orbiting them, but there is no indication when those planets were formed. There may be new planets forming around different stars.
By accretion, through gravitational attraction and collision.
Not in our own solar system. The orbits of all the planets in the solar system have stabilized, and there isn't enough mass in the remaining asteroids to form a new planet. Else where, however, there are solar systems that are still forming, with new planets that are yet to form.
You can detect planets around are star only if they are of sufficient mass, They will cause the star to wobble (due to its gravity) as it rotates this can be seen and the position of the planet inferred.
there is 7 new planets
Planets are not necessarily in a galaxy but chances are very slim that in a galaxy that is not just newly forming there would not be any exoplanets.
The last part of the planet forming process is when planets clear their orbital path of debris. This means that they have become the dominant objects in their orbit and have gathered most of the material around them, allowing them to grow and solidify into their final form.
Well, we cannot say that they are two new planets but they are new discoveries and considered as dwarf planets. Xena and Ceres
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The theory that describes the formation of the sun and planets from a single rotating disk of gas and dust is the solar nebula theory. This theory suggests that as the nebula contracted under gravity, it flattened into a disk, with the sun forming at the center and the planets forming from material in the disk.
No (except for trace amounts). Oxygen is chemically active - without plant life continuously forming new oxygen there wouldn't be any on Earth either.
yes, in 2015 scientists think new planets will be created
NASA has launched the Kepler mission to search for new planets.