Andromeda galaxy’s ‘halo’ is nudging the Milky Way

This artist’s illustration shows the unexpected dimming of the star Betelgeuse. This extremely distant galaxy, which looks similar to our own Milky Way, appears like a ring of light. This artist’s interpretation shows the calcium-rich supernova 2019ehk. The orange represents the calcium-rich material created in the explosion. Purple reveals gas shed by the star right […]