BusinessA resident’s guide to avoiding lethal blasts from the...

A resident’s guide to avoiding lethal blasts from the Galaxy

-


Astronomy and astrophysics

Astronomers map out the most benign environments for life in the Milky Way over the past 13 billion years.

The Milky Way is a dangerous place, full of exploding stars and bursts of γ-rays that could strip off a planet’s protective atmosphere and irradiate any life on the surface. An analysis shows that the Galactic neighbourhood safest from these cosmic killers has shifted over time, moving from the Galaxy’s outskirts towards its centre.

Riccardo Spinelli at the University of Insubria in Como, Italy, and his colleagues calculated how often supernovae and γ-ray bursts have occurred throughout the Galaxy, and whether those explosions might have happened near rocky planets. From the Milky Way’s formation more than 13 billion years ago until 6 billion years ago, the most sheltered place for life was the Galaxy’s outskirts.

But around 4 billion years ago, the planet-dense region stretching roughly 2,000–8,000 parsecs from the Galaxy’s centre became the lowest-risk zone. Earth is on that zone’s outer edge. One or two lethal radiation bursts could have reached Earth in the past 500 million years, the scientists say — supporting the idea that a γ-ray blast caused the mass extinction at the end of the Ordovician period, around 445 million years ago.



Source link

Latest news

Voice Control In Mobile Apps – How To Do It

Man has always aimed to make life comfortable and easy. When he wanted to travel from place to place,...

Proven Digital Innovations to Scale-Up Business Operations

Vast improvements in digital technology have propelled the competitive market to achieve business transformation and create more effective ways...

Is Bitcoin A Burden For CPAs To Manage?

Since the beginning of 2022, I have been pounding the pavement to talk with brick-and-mortar merchants about accepting...

Final Audio E3000C and E1000C Wired Earphones Review

The introduction of high-resolution audio to Apple Music in 2021 boosted the already active audiophile movement, and increased...

Must read

Voice Control In Mobile Apps – How To Do It

Man has always aimed to make life comfortable and...

Proven Digital Innovations to Scale-Up Business Operations

Vast improvements in digital technology have propelled the competitive...

You might also likeRELATED
Recommended to you