An emerald-colored comet discovered at the start of the month has just "erupted" as it continues to race toward the inner solar system, before eventually slingshotting around the sun.
The icy outburst, which temporarily caused the comet to brighten, could be a sign that it is a "cold volcano." The eruption also may have implications for whether the comet will be visible to the naked eye — but it is too soon to tell for sure.
