Webb telescope spots water, and a new mystery, in rare main belt comet

Using the James Webb Space Telescope, astronomers have detected a unique comet in our solar system, solving a long-sought scientific puzzle while discovering a new cosmic enigma.

According to a recent observation, the chemical component was found for the first time in a main belt comet or a comet located in the main asteroid belt between the orbits of Mars and Jupiter. Scientists have been researching the origins of Earth’s abundant water.

Before coming to their conclusion, the astronomers spent 15 years using various observing techniques.

With the help of Webb’s NIRSpec (Near-Infrared Spectrograph), they have discovered gas for the first time, namely water vapor, close to a comet in the main asteroid belt.

“We’re not sure how all this water got here”

It suggests that the area can hold onto water ice from the early solar system. However, scientists also discovered a conundrum because Comet 238P/Read did not have any measurable carbon dioxide, in contrast to previous comets.

Stefanie Milam, a co-author on the study that reported the discovery and Webb’s deputy project scientist for planetary science, was quoted by NASA as saying: “Our water-soaked world, teeming with life and unique in the universe as far as we know, is something of a mystery – we’re not sure how all this water got here”.

“Understanding the history of water distribution in the solar system will help us to understand other planetary systems, and if they could be on their way to hosting an Earth-like planet,” she added. 

A main belt comet is an object that resides in the main asteroid belt yet has a halo, or coma, and tail like a comet. Comet Read is one of these objects. () One of the first three comets to be used to create the categorization of main belt comets, which is a relatively modern one, was Comet Read.

Before, it was thought that comets resided outside of Neptune’s orbit, in the Kuiper Belt and Oort Cloud, where their ices might be shielded from the Sun.

The absence of carbon dioxide, which generally makes up 10% of the volatile material in a comet and is easily vaporized by the Sun’s radiation, was a bigger surprise.

The Comet Read may have had carbon dioxide when it formed, but due to the high temperatures it has now lost, according to scientists.

Leading researcher and University of Maryland astronomer Michael Kelley was quoted by NASA as saying: “Being in the asteroid belt for a long time could do it – carbon dioxide vaporizes more easily than water ice, and could percolate out over billions of years.”