Social Media Sidebar

Announcement

Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

People say we're running out of energy. That's only true if we stick with these old 19th century technologies. We are awash in energy from sunlight.

 

Ray Kurzweil

 

Face of the moon changes every 81,000 years

RATE THIS! +23
Posted in Science on 13th Oct, 2016 02:03 PM by AlexMuller

The moon is bombarded by so much rock that its surface gets a complete facelift every 81,000 years, according to a NASA study. This churn, affecting the top 2cm of loose moon dust, happens 100 times more frequently than previously thought. Asteroids crashing into the moon create on average 180 new craters at least 10 metres in diameter every year.

 
The findings, published in Nature, come from “before and after” pictures taken by Nasa’s Lunar Reconnaissance Orbiter spacecraft, which has been mapping the moon since 2009.
 
By comparing images of the same area at regular intervals, a team of scientists led by Emerson Speyerer from Arizona State University in Tempe was able to tally the number of new craters and extrapolate to the entire surface of the moon.
 
“We detected 222 new impact craters and found 33% more craters with a diameter of at least 10m than predicted” by earlier models, the researchers concluded.
 
The scientists also found thousands of subtler disturbances on the surface, which they described as “scars” from smaller secondary impacts that – over thousands of years – churned up the top layer of the moon without creating craters.
 
Earth is also constantly pelted by asteroids and meteors but is protected by a thick atmosphere.
 
More than 100 tonnes of dust and sand-sized particles rain down on the planet every day. But even those up to 25m across (80ft) usually explode and disintegrate in the upper layers of our atmosphere, causing little or no damage, according to Nasa.
 
The moon has next to no atmosphere, only contains about 100 molecules of gases and elements per cubic centimetre.
 
Earth’s atmosphere at sea level, by contrast, has about 100 billion billion molecules per cubic centimetre.

Tags: spacemoonNASAastronomyresearchcrater

Read original article » Back to category

Comments



 

Recent headlines

  • Posted in Medicine on 2017-08-21 19:26:00
    Darmiyan’s software detects early stages of Alzheimer’s..read more
    Posted in Business on 2017-08-21 19:20:53
    Google needs to pay Apple a fortune to remain the default.....read more
    Posted in Medicine on 2017-08-21 19:15:22
    Artificial Intelligence beats doctors at diagnosing.....read more
    Posted in Science on 2017-08-20 16:55:58
    Computer Approaches Human Skill for First Time in Mapping.....read more
    Posted in Science on 2017-08-20 16:51:23
    Researchers use polystyrene to make next-generation of.....read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Scientists probe Neptune's depths to reveal secrets of icy.....read more
    Posted by AlexMuller
    New terahertz imaging approach could speed up skin cancer.....read more
    Posted by AlexMuller
    Rebutting the claim that antidepressants do not work..read more
    Posted by AlexMuller
    Artificial neural networks decode brain activity during.....read more
    Posted by AlexMuller
    Four Earth-sized planets detected orbiting the nearest.....read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me