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Tuesday, June 22, 2021

Earth is waging a laser duel with the Carina Nebula

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Amit Kumar
Amit Kumar is editor-in-chief and founder of Revyuh Media. He has been ensuring journalistic quality and shaping the future of Revyuh.com - in terms of content, text, personnel and strategy. He also develops herself further, likes to learn new things and, as a trained mediator, considers communication and freedom to be essential in editorial cooperation. After studying and training at the Indian Institute of Journalism & Mass Communication He accompanied an ambitious Internet portal into the Afterlife and was editor of the Scroll Lib Foundation. After that He did public relations for the MNC's in India. Email: amit.kumar (at) revyuh (dot) com ICE : 00 91 (0) 99580 61723

It is a specific technique devised by astronomers to be able to observe distant stars without Earth’s atmospheric distortion causing vision problems

Anyone who looks at the photograph with the naked eye may think that a cosmic weapon of great power is fired from a planet located in a galaxy far, far away towards us on Earth. Or it may differ that this is a special effect created for a sci-fi movie. But nothing further from this. This shot at the stars is real and comes from Earth.

Among the largest nebulae in the southern night sky, we find the Carina Nebula or also called Eta Carinae, which is a very luminous super-giant star. Estimates of its mass range from 100 to 150 times the mass of the Sun and its luminosity is approximately four million times of our star. This celestial object is currently the most massive star that can be studied in great detail, due to its location and size. Several other known stars may be brighter and more massive, but the data on them is much less robust.

For several decades, this nebula has been a constant object of visualization by great astronomers who take advantage of the powerful Very Large Telescope (VLT) of the European Southern Observatory (ESO), managed by the European Space Agency. This huge observatory is responsible for the impressive rays of light that shoot towards this star formation located approximately 7,500 light-years from Earth.

In this image released by astronomers, the nebula appears as an impressive pink cloud in the clear sky above ESO’s Paranal Observatory in Chile, home to the VLT. The Carina Nebula is a vast cloud of dust and gas; This gas is ionized and made to shine by the stars within the nebula itself.

The modern adaptive optics facility installed in one of the VLT’s 8.2-meter unit telescopes (UT) is fully operational, sending the orange laser beams from the UTs into the atmosphere where they alter the sodium particles and make them shine. This creates artificial ‘stars’ that are used to measure the blurring effects caused by Earth’s atmosphere, which are then corrected by the telescope.

“Eta Carinae is actually a pair of two giant stars, which have been constantly exploding in a spectacular eruption of gas and dust for almost 200 years and now we are shooting lasers at it,” said the astronomers responsible for the ingenious astronomical trick to look through time and space.

An innovative observation technique

Seeing that far into space can be tricky, even when viewing one of the brightest objects in our galaxy through one of the most powerful telescopes on Earth as there is always one very annoying common problem: the gaseous atmosphere of the Earth always gets in the way, blurring and distorting the view of celestial objects.

That’s where the lasers come in. According to ESO, scientists fire these lasers from one of the pieces that make up the Very Large Telescope to simulate distant stars. Sodium particles in the atmosphere make the rays glow orange. Astronomers then focus on these artificial stars to measure how much these rays are blurred by Earth’s atmosphere. By practicing with fake stars, astronomers can more effectively calibrate the telescope to correct atmospheric blur by looking at real stars, galaxies, and explosive objects like Eta Carinae.

So, to summarize: Earth scientists are actively firing lasers at the heart of an exploding star system, but only so they can get to know it better. In our beautiful Milky Way galaxy, it is simply what can be done so far as a distant neighbor.

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