'Dark Galaxy' continues to astronomers

The Hubble Space Telescope has failed to reveal the expected number of stars in the mysterious cloud of hydrogen on the size of a galaxy known as VIRGOHI21.

The research reinforces the idea that the gas cloud is the only known example of a "dark galaxy" that never initiates the birth of a star.

It is thought that a galaxy is formed of normal matter, or which has collected in clouds of hypothetical dark matter. But scans have shown fewer galaxies than expected, suggesting that, for unknown reasons, 

Galaxy of Dorian Gray

NASA has made some observations about the galaxy called "I Zwicky 18", ruling out the possibility that it is a young galaxy in the nearby universe, as was believed until now.  It can actually be considered an adult, that looks young and that resembles galaxies typically found only in the early Universe.  However, Hubble has found faint stars, older within this galaxy, suggesting that "I Zwicky 18" may have formed while many other galaxies .

The black hole of the Milky Way

Japanese astronomers has discovered that the black hole in the center of our galaxy unleashed a powerful blast for three centuries, thanks to observations with the ESA observatory XMM-Newton and other X-ray satellites and NASA Japanese.  This discovery helps solve a longstanding mystery: why the black hole of the Milky Way is so inactive.  This black hole, known as Sagittarius A-star (A *), is truly massive, contains about four million times the mass of our Sun, the energy radiated from its surroundings is billions of times weaker than the emitted from central black holes in other galaxies.