Friday, October 30, 2015

Amazing Green Grass

Amazing Grass :
All we know about Grass is, its just a small thing . but there is a lot or verity in green grass. These photos are one of the verity's of grass. 
Photo location is  yearcaud [Tamil Nadu]
You can find the Types of Grass in this link

Green Grass


Photos by : Canon IXUS 132
Location: Tamil Nadu (Yearcaud)

Ozone Hole 2015 (Status)

Ozone Layer Status at 2015

Image credits: NASA App

The ozone hole over Antarctica grew relatively large in 2015, according to data acquired by theOzone Monitoring Instrument (OMI) on NASA's Aura satellite and the Ozone Monitoring and Profiler Suite(OMPS) on the NASA-NOAA Suomi NPP satellite.

On October 2, 2015, OMI observed that the hole had reached its largest single-day area for the year. The image above, based on data acquired with OMI, shows the hole on that day. It spanned 28.2 million square kilometers (10.9 million square miles)--the fourth-largest area measured since the start of the satellite record in 1979. The largest single-day ozone hole recorded by satellite was 29.9 million square kilometers (11.5 million square miles) on September 9, 2000.

The ozone "hole" is not literally a hole; rather, the phenomenon is defined as the area where the concentration of ozone drops below the historical threshold of 220 Dobson Units. In the image above, those areas are purple and blue.

The ozone depletion phenomenon is seasonal, starting each year during the Antarctic spring and peaking between mid-September and early October. In 2015, the hole started slowly but then quickly expanded to cover a large area. The average size in September-October 2015 was 25.6 million square kilometers (9.9 million square miles)--also the fourth largest since the start of the satellite record. The largest September-October average on record was 26.6 million square kilometers (10.3 million square miles) in 2006.

In 2015, ozone concentrations also plunged lower than in recent years. On October 4, ozone reached an annual minimum concentration of 101 Dobson Units.

While the ozone hole area was large in 2015, the size was consistent with what scientists know about ozone depletion and chemistry. According to NASA atmospheric scientist Paul Newman, there are still plenty of ozone-depleting chlorine and bromine compounds present in the stratosphere. Moreover, the lower stratosphere was colder than in previous years, which creates favorable conditions for ozone-depleting chemical reactions.

Visit World of Change: Antarctic Ozone Hole to see how the holes have evolved since 1979.

References and Related Reading

NASA Earth Observatory (2015) World of Change: Antarctic Ozone Hole.NASA Goddard (2015, October 23) Ozone Hole Watch. Accessed October 26, 2015.NASA Goddard (2015, October 22) NASA Study Shows That Common Coolants Contribute to Ozone Depletion. Accessed October 26, 2015.NASA Goddard (2015, October 7) 2015 Antarctic Ozone Hole Area Approaches Annual Maximum. Accessed October 26, 2015.Ozone Monitoring and Profiler Suite blog (2015, October 11) The Ozone Hole for 2015.Accessed October 26, 2015.

NASA images from Ozone Hole Watch. Caption by Kathryn Hansen.

Instrument(s):Aura - OMI


Mapping Pluto's "Broken Heart"


Image credits: NASA


In addition to transmitting new high-resolution images and other data on the familiar close-approach hemispheres of Pluto and Charon, NASA's New Horizons spacecraft is also returning images '“ such as this one '“ to improve maps of other regions.

This image was taken by the New Horizons Long Range Reconnaissance Imager (LORRI) on the morning of July 13, 2015, from a range of 1.03 million miles (1.7 million kilometers) and has a resolution of 5.1 miles (8.3 kilometers) per pixel. It provides fascinating new details to help the science team map the informally named Krun Macula (the prominent dark spot at the bottom of the image) and the complex terrain east and northeast of Pluto's 'heart'� (Tombaugh Regio). Pluto's north pole is on the planet's disk at the 12 o'clock position of this image.


New Horizons

The Witch Head Nebula (NASA)



Double, double toil and trouble; Fire burn, and cauldron bubble .... maybe Macbeth should have consulted the Witch Head Nebula. A suggestively shaped reflection nebula, this cosmic crone is about 800 light-years away though. Its frightening visage seems to glare toward nearby bright star Rigel in Orion, just off the right edge of this frame. More formally known as IC 2118, the interstellar cloud of dust and gas is nearly 70 light-years across, its dust grains reflecting Rigel's starlight. In this composite portrait, the nebula's color is caused not only by the star's intense bluish light but because the dust grains scatter blue light more efficiently than red. The same physical process causes Earth's daytime sky to appear blue, although the scatterers in planet Earth's atmosphere are molecules of nitrogen and oxygen.

Image Credit & Copyright: Jeff Signorelli