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Detailed explanation-1: -The Hubble Space Telescope has made an unexpected discovery of a dwarf galaxy in our cosmic backyard, located just 30 million light-years away, scientists say.

Detailed explanation-2: -The first dwarf galaxy discovered by astronomers was unsurprisingly a satellite of the Milky Way. The Sculptor dwarf galaxy located 300,000 light-years away was first observed by Harlow Shapley in 1937. And these small clusters of stars, gas, and dust, are still delivering surprises.

Detailed explanation-3: -The newly discovered cosmic neighbour, nicknamed Bedin 1 by the astronomers, is a modestly sized, elongated galaxy, the study said. It measures only around 3, 000 light-years at its greatest extent - a fraction of the size of the Milky Way. Not only is it tiny, but it is also incredibly faint.

Detailed explanation-4: -The James Webb Space Telescope has discovered its first new exoplanet, an Earth-sized rocky planet called LHS 475 b. Located just 41 light-years away, the planet orbits very close to a small, dim star, completing a full orbit in just two days.

Detailed explanation-5: -September 1998. Astronomers using Hubble published the first evidence that the expansion of the universe is not slowing down, as expected, but accelerating. The results were based on distance measurements to supernovae located so far away that they allowed astronomers to determine the expansion rate of the universe.