About Careers MedBlog Contact us

Dust on Ocean Floor is 25M-Year-Old, Clues to Supernovae Hypotheses

by Himabindu Venkatakrishnan on January 21, 2015 at 7:04 PM
Font : A-A+

 Dust on Ocean Floor is 25M-Year-Old, Clues to Supernovae Hypotheses

The galactic dust from the last 25 million years that has settled on the ocean floor has been analysed and has provided new insight into supernovae theories.

They have analysed extraterrestrial dust thought to be from supernovae, which has settled on ocean floors to determine the amount of heavy elements created by the massive explosions.


Anton Wallner, from the Research School of Physics and Engineering at The Australian National University (ANU), said that small amounts of debris from these distant explosions fall on the earth as it travels through the galaxy.

They found that there was much less of the heavy elements such as plutonium and uranium than they expected, he further added.

The findings are at odds with current theories of supernovae, in which some of the materials essential for human life, such as iron, potassium and iodine are created and distributed throughout space.

Supernovae also create lead, silver and gold, and heavier radioactive elements such as uranium and plutonium.

Dr Wallner's team studied plutonium-244 which serves as a radioactive clock by the nature of its radioactive decay, with a half-life of 81 million years.

The team analysed a 10 centimetre-thick sample of the earth's crust, representing 25 million years of accretion, as well as deep-sea sediments collected from a very stable area at the bottom of the Pacific Ocean.

Dr Wallner further mentioned that it seems that these heaviest elements might not be formed in standard supernovae after all and it might require rarer and more explosive events such as the merging of two neutron stars to make them.

Source: ANI
This site uses cookies to deliver our services.By using our site, you acknowledge that you have read and understand our Cookie Policy, Privacy Policy, and our Terms of Use  Ok, Got it. Close

Dust on Ocean Floor is 25M-Year-Old, Clues to Supernovae Hypotheses Personalised Printable Document (PDF)

Please complete this form and we'll send you a personalised information that is requested

You may use this for your own reference or forward it to your friends.

Please use the information prudently. If you are not a medical doctor please remember to consult your healthcare provider as this information is not a substitute for professional advice.

Name *

Email Address *

Country *

Areas of Interests