• Web
  • Humsa
  • Videos
  • Forum
  • Q2A
rabia shakeel : meri dua hai K is bar imran khan app is mulk k hukmaran hun To: suman(sialkot) 4 years ago
maqsood : hi how r u. To: hamza(lahore) 4 years ago
alisyed : hi frinds 4 years ago
nasir : hi To: wajahat(karachi) 4 years ago
khadam hussain : aslamoalikum pakistan zinsabad To: facebook friends(all pakistan) 4 years ago
Asif Ali : Asalaam O Aliakum . To: Khurshed Ahmed(Kashmore) 4 years ago
khurshedahmed : are you fine To: afaque(kashmore) 4 years ago
mannan : i love all To: nain(arifwala) 4 years ago
Ubaid Raza : kya haal hai janab. To: Raza(Wah) 4 years ago
qaisa manzoor : jnab AoA to all 4 years ago
Atif : Pakistan Zinda bad To: Shehnaz(BAHAWALPUR) 4 years ago
khalid : kia website hai jahan per sab kuch To: sidra(wazraabad) 4 years ago
ALISHBA TAJ : ASSALAM O ELIKUM To: RUKIYA KHALA(JHUDO) 4 years ago
Waqas Hashmi : Hi Its Me Waqas Hashmi F4m Matli This Website Is Owsome And Kois Shak Nahi Humsa Jaise Koi Nahi To: Mansoor Baloch(Matli) 4 years ago
Gul faraz : this is very good web site where all those channels are avaiable which are not on other sites.Realy good. I want to do i..... 4 years ago
shahid bashir : Mein aap sab kay liye dua'go hon. 4 years ago
mansoor ahmad : very good streming 4 years ago
Dr.Hassan : WISH YOU HAPPY HEALTHY LIFE To: atif(karachi) 4 years ago
ishtiaque ahmed : best channel humsa live tv To: umair ahmed(k.g.muhammad) 4 years ago
Rizwan : Best Streaming Of Live Channels. Good Work Site Admin 4 years ago
NASA photos show possible water flows on Mars
Source: Foxnews | 16-02-2014

New clues are emerging about the mysterious streaks that appear on Mars' surface during warm weather, though scientists still can't say for sure that they're caused by flowing water.

The marks, known as recurring slope lineae (RSL), snake down some crater walls and other inclines when the mercury rises on the Red Planet. New research finds seasonal changes in iron minerals at RSL sites, suggesting that brines containing an iron antifreeze may flow there from time to time — but direct evidence of water remains elusive.

"We still don't have a smoking gun for existence of water in RSL, although we're not sure how this process would take place without water," Lujendra Ojha, a graduate student at Georgia Tech in Atlanta, lead author of two recent RSL studies, said in a statement. (Ojha discovered the RSL in 2011, while an undergraduate at the University of Arizona.) [Photos: The Search for Water on Mars]

Ojha and his colleagues studied images of 13 RSL sites taken by the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM), an instrument aboard NASA's Mars Reconnaissance Orbiter (MRO). They saw relatively high concentrations of iron minerals at most of the sites.

"Just like the RSL themselves, the strength of the spectral signatures varies according to the seasons," Ojha said. "They're stronger when it's warmer and less significant when it's colder."

Many scientists think the recurring slope lineae are created by water flowing just beneath the Martian surface. This water — which would leave the iron antifreezes and other minerals in its wake — likely contains salts that lower its freezing point significantly, allowing it to stay liquid despite frigid Red Planet temperatures.

While the researchers didn't see any spectral signatures of water in the CRISM images, that doesn't rule out the substance's presence at RSL sites, scientists said.

For example, the observations were made exclusively in the afternoon and thus could have missed surface water appearing in the morning. Further, each CRISM image observed a large area, possibly making it tough to spot signs of water in the narrow RSL streaks.

The researchers reported these results late last year in the journal Geophysical Research Letters. In another study, due out next month in the journal Icarus, a team led by Ojha analyzed pictures snapped by MRO and NASA's Mars Odyssey orbiter, looking for patterns in RSL formation on the Red Planet.

The team found 200 locations where conditions seemed ideal for seasonal streaks — areas in the southern mid-latitudes with rocky cliffs — but found only 13 with actual RSL marks.

"The fact that RSL occur in a few sites and not others indicates additional unknown factors such as availability of water or salts may play a crucial role in RSL formation," Ojha said.

Unraveling the mystery of Mars' seasonal dark lines could reveal exciting things about the Red Planet, such as its potential to host life as we know it, NASA officials said.

"The flow of water, even briny water, anywhere on Mars today would be a major discovery, impacting our understanding of present climate change on Mars and possibly indicating potential habitats for life near the surface on modern Mars," MRO project scientist Richard Zurek, of NASA's Jet Propulsion Laboratory in Pasadena, Calif., said in a statement.

Related News
Source: The News | 07-02-2013
NASA science balloon breaches longest flight record After more than 55 days flying over Antarctica, NASA's huge Super-TIGER scientific balloon has broken the record for the longest flight of its kind, bringing back a wealth of data, the US space agency said Monday. The Super-TIGER balloon spent 55 days, one hour and 34 minutes aloft at an altitude of 127,000 feet (38,710 meters), beating the old record set..... Read more
Source: CNN | 07-01-2013
Six gadget trends to look for at CES Smartphones inch closer to becoming remote controls for your life at next week's 2013 Consumer Electronics Show in Las Vegas. The annual event is the largest gadget conference in the world, where major technology companies and scrappy startups can show off their latest innovations.   If the show sets the tone for the year's technology, 2013 will ..... Read more
Source: IINA | 26-11-2012
 UN call to boost measures to combat Internet racism The surge in websites that promote hate speech and racism requires States to implement measures to combat online extremism without curbing freedom of speech, a United Nations independent expert said today. “The increase of extremist hate websites, the use of the Internet and social media by extremist groups and individuals to propagate hate s..... Read more
Latest News
Source: Dunya News | 06-05-2014
Source: Dunya News | 06-05-2014
Source: Dunya News | 05-05-2014
Source: Dunya News | 05-05-2014