Extragalactic planet of at least 1.25 times that of Jupiter had been potentially discovered by the European Southern Observatory (ESO) orbiting a star of extragalactic origin, even though the star now has been absorbed by our own galaxy. HIP 13044 is a star about 2,000 light years away in the southern constellation of Fornax, part of the Helmi stream of stars, a leftover remnant of a small galaxy that collided with and was absorbed by the Milky Way over 6 billion years ago. However, subsequent analysis of the data revealed problems with the potential planetary detection: for example an erroneous barycentric correction
Extragalactic cosmic ray many more possible sources scientists are considering. These include colliding galaxy systems, accretion flow shocks to clusters of galaxies, and more exotic processes from the very early universe, such as the decay of superheavy particles trapped in the galactic halo, or topological defects. Due to the very low flux of extragalactic cosmic particles received on Earth, little is known about their composition. Most estimates, based on theoretical and numerical models, predict that light atomic nuclei such as protons are the dominant particle type. Extragalactic cosmic ray Extragalactic cosmic rays are very-high-energy particles that flow into the Solar System from beyond