
In early in 2002, the unusual variable star V838 Monocerotis (V838 Mon) briefly increased in brightness to become 600,000 times more luminous than the Sun. Exactly what causes this is unknown, but variability among stars is not rare. After the star has faded, the pulse of light from this sudden brightening travels out into space, passing through clouds of dust grains that erupted from the star long ago.
That pulse of light now lights up details of the interstellar dust surrounding the star, and because the path length of the light is longer, it arrives later. This ‘light echo’ effect has produced the most spectacular and dynamic light echo ever seen.
That pulse of light now lights up the interstellar dust surrounding the star, which is 20,000 light years away. Because the path length of the reflected light is slightly longer it arrives later, and is seen as spectacular and dynamic light echo.
Photography NASA, ESA, and H. Bond (STScI).
Post by David Malin, From Earth to the Universe team.
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