| Milky way galaxy (4) |  |
Recent searches for planets around other stars (xoplanets have shown that super-Earths like GJ 1214b are among the most common type of planets in the Milky way galaxy.
The result of the merger has been to make Mrk 231 an energetic starburst galaxy with a star formation rate 100 times greater than that of our Milky way galaxy.
The space between stars is not empty it contains a vast reservoir of diffuse material with about 5-10%of the total mass of our Milky way galaxy.
These extraordinary rings, produced by an intense flare from a neutron star, provide astronomers a rare chance to determine how far across the Milky way galaxy the star is from Earth.
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