Astronomers Caught This Amazing Stellar Pulse With The Hubble Telescope

hubble image light echo

NASA and The Hubble Heritage Team (AURA/STScI)

"Light Echo" Illuminates Dust Around Supergiant Star V838 Monocerotis

Illuminate the universe and you'll see more beauty than you could ever imagine.

That's exactly what a cosmic phenomenon, called a light echo, does.

This Hubble image to the right was taken in February, 2004 and is a consequence of the revealing power of the light echo.
This isn't just a pretty image, though. It's one of many that the Hubble has caught that actually teaches us something new about how our universe works.

We think it's one of the most stunning scientific images we've seen from the telescope because astronomers had to wait nearly two years for it.

That's because before 2002, the only thing we could see in this region was a supergiant star.

But in January 2002, the star, located 20,000 light years from Earth, gave off a blindingly bright pulse of light.

For the brief period of time the pulse lasted, the star was the most luminous star in our galaxy, shining at 600,000 times brighter than our sun. The star eventually faded, but the light it emitted continued to travel outward, illuminating the star's surrounding nebula, as shown in the animation below.

hubble light echo

Our Universe Visualized

Animation of a light echo in action.

Between May 2002 to February 2004, Hubble snapped five images of the star, shown below. With each succeeding image, Hubble gave us a more beautiful look into this nebulous cocoon.

hubble light echo progression

NASA, ESA, H.E. Bond (STScI) and The Hubble Heritage Team (STScI/AURA)

Series of Hubble images showing a light-echo progression.

What we see if the result of starlight propagating through space and then reflecting off the nebula's gas and dust, just like sounds bounces off of walls in a cave creating an echo-effect. Some of that reflected light heads toward Earth and was detected by Hubble.

Below is a gorgeous simulation showing the full, gradual progression of the most stunning light echo we've ever witnessed.