Scientists have long known that the Milky Way is what it is today because of mergers with other galaxies, but exactly when those occurred has been less clear.
Scientists have long known that the Milky Way is what it is today because of mergers with other galaxies, but exactly when those occurred has been less clear.
While ESA’s satellite INTEGRAL was observing the sky, it spotted a burst of gamma-rays - high-energy photons - coming from the..