Scientists reclassify galaxy PBC J2333.9-2343 after discovering supermassive black hole facing Earth.
Researchers hypothesized that relativistic jet from black hole had changed direction, requiring more observations.
Galaxy was initially classified as radio galaxy, but now points center towards Earth.
Galaxy stretches nearly 4 million light-years across and is nearly 40 times size of Milky Way.
Scientists unsure what caused the shift, but some believe it collided with another galaxy.
It is unclear how direction of black hole will affect our galaxy.
Three near-Earth asteroids discovered in inner solar system, posing serious risk to Earth.
Royal Astronomical Society did not comment on the discovery of the black hole.
The nucleus of the galaxy is not feeding the lobes, indicating they are relics of past activity.
Structures closer to nucleus represent younger and active jets.
Scientists continue to study galaxy for more information on black hole and its impact on Earth.