NASA probe spots possible source of sand on Mars

NASA probe spots possible source of sand...

NASA's Mars Reconnaisance Orbiter (MRO) has beamed back an image showing one possible place where sand grains are being produced on the red planet on Wednesday.

The region exhibits dark material that is being eroded from dark layers in the bedrock of a semicircular depression near the boundary of the Southern highlands and the Northern lowlands, NASA researchers said.

Downslope lineations support the notion that these dark sediments are derived locally, and did not accumulate here by coincidence because of the winds. The grains of sand that make up sand dunes on Earth and Mars have a hazardous existence because of the way that they travel.

Wind-blown sand is lifted above the surface of each planet before crashing onto the ground and bouncing in a sequence of repeated hops, a process called saltation.

Sand grains can also roll along the ground as they are blown by the wind, and they are also jostled by other sand gains that are similarly flying across the surface. All of these repeated impacts tend to wear down the sand grains, smoothening them into a more spherical shape and breaking off small fragments that supply the vast dust deposits of Mars.

This process, known as comminution, ultimately destroys sand grains and limits the length of time that the particles exist. The fact that we see active sand dunes on Mars today requires that sand particles must be resupplied to replace the grains that are lost over time. However, modern day sources of sand on Mars were not known.


PostedOn: 11 Oct 2017 Total Views: 68




India to be ready with 5G roadmap by Jun...

India to be ready with 5G roadmap by June

India will be ready with a full roadmap for 5G technology by June this year, Telecom Secretary Aruna Sundararajan said on Tuesday. Terming 5G important for India's massive "digitisation and digitalisation" efforts, Sundararajan said the government is working with all stakeholders including the indus...

28 Mar 2018

Xiaomi to invest nearly Rs 7,000 crore i...

Xiaomi to invest nearly Rs 7,000 crore in 100 Indi...

Xiaomi, the Chinese smartphone major, is now turning a venture capitalist in India with the company declaring its objective to help 100 startups in India and the amount it hasallocatedfor this is Rs 60-70 billion. The investments may be done over the next five years. It is understood that the compan...

28 Mar 2018

Oracle wins legal battle against Google ...

Oracle wins legal battle against Google over Java ...

In what could change the dynamics of software development by tech giants, an appeals court in the US has ruled that Google violated copyright laws when it used Oracle's open-source Java software to build the Android platform. "There is nothing fair about taking a copyrighted work verbatim and using ...

28 Mar 2018

Whatsapp now allows users to delete sent...

Whatsapp now allows users to delete sent messages ...

The Facebook-owned messaging app,WhatsApp has extended the time frame in which a message can be deleted. WhatsApp had introduced the Delete for Everyone feature last year in November. In this feature, the users were allowed to delete a sent message within 420 seconds or 7 minutes. However, the compa...

04 Mar 2018

Foldable phones within five years

Foldable phones within five years

Foldable phones will be on the market within five years, a member of the Graphene Flagship programme said on Tuesday. The pan-European research initiative is made up of over 150 academic and industrial institutions across 23 countries, who are tasked with taking graphene out of the lab and on to the...

28 Feb 2018

Facebook unveils local news accelerator ...

Facebook unveils local news accelerator to help pu...

To help "metro newspapers" take their digital subscription business to a new level, Facebook has launched a local news accelerator for news publishers. The $3 million, three-month pilot programme titled "Journalism Project: Local News Subscriptions Accelerator" will begin in the US with 10-15 metro ...

28 Feb 2018

‘Dhanush’ ballistic missile successfully...

‘Dhanush’ ballistic missile successfully test-fire...

India on Friday successfully test-fired the nuclear-capable ‘Dhanush’ ballistic missile with a strike range of 350 kms from a naval ship off Odisha coast, defence officials said. The surface-to-surface missile, a naval variant of the indigenously-developed ‘Prithvi’ missile, ...

24 Feb 2018

Microsoft introduces e-mail address supp...

Microsoft introduces e-mail address support for 15...

In a major and important announcement that should cheer a lot of Indian computer users, Microsoft hasintroducedsupport for 15 Indian languages within its frequently used software. This means email addresses can be stored on Microsoft Outlook in the local languages and used for sending out mails from...

23 Feb 2018