NASA’s TRMM satellite confirms 2010 landslides
A NASA study using TRMM satellite data revealed that the year 2010 was a particularly bad year for landslides around the world.
A recent NASA study published in the October issue of the Journal of Hydrometeorology compared satellite rain data from NASA’s Tropical Rainfall Measurement Mission (TRMM) to landslides in central eastern China, Central America and the Himalayan Arc, three regions with diverse climates and topography where rainfall-triggered landslides are frequent and destructive hazards to the local populations.
The work, led by Dalia Kirschbaum, a research physical scientist in the Hydrological Sciences Laboratory at NASA’s Goddard Space Flight Center in Greenbelt, Md., is part of an ongoing effort to catalog worldwide rainfall-triggered landslides—one of the world’s lesser known but often catastrophic natural hazards. Locating them is a step in an effort to be able, one day, to predict and warn.
This work was funded by the upcoming Global Precipitation Measurement (GPM) mission, which will improve upon current rainfall datasets, with real-time assessment of rainfall accumulations that lead to landslide triggering. The GPM Core satellite is set to launch in 2014 and will extend coverage of precipitation measurements using a constellation of satellites to deliver a global rain dataset every three hours.
For Detail : http://www.nasa.gov/gpm
According to the standard theory, our universe sprang into existence as “singularity” around 13.7 billion years ago. What is a “singularity” and where does it come from? Well, to be honest, we don’t know for sure. Singularities are zones which defy our current understanding of physics. They are thought to exist at the core of “black holes.” Black holes are areas of intense gravitational pressure. The pressure is thought to be so intense that finite matter is actually squished into infinite density (a mathematical concept which truly boggles the mind). These zones of infinite density are called “singularities.” Our universe is thought to have begun as an infinitesimally small, infinitely hot, infinitely dense, something – a singularity. Where did it come from? We don’t know. Why did it appear? We don’t know.
After its initial appearance, it apparently inflated (the “Big Bang”), expanded and cooled, going from very, very small and very, very hot, to the size and temperature of our current universe. It continues to expand and cool to this day and we are inside of it: incredible creatures living on a unique planet, circling a beautiful star clustered together with several hundred billion other stars in a galaxy soaring through the cosmos, all of which is inside of an expanding universe that began as an infinitesimal singularity which appeared out of nowhere for reasons unknown. This is the Big Bang theory.
Evidence for the Theory
What are the major evidences which support the Big Bang theory?
- First of all, we are reasonably certain that the universe had a beginning.
- Second, galaxies appear to be moving away from us at speeds proportional to their distance. This is called “Hubble’s Law,” named after Edwin Hubble (1889-1953) who discovered this phenomenon in 1929. This observation supports the expansion of the universe and suggests that the universe was once compacted.
- Third, if the universe was initially very, very hot as the Big Bang suggests, we should be able to find some remnant of this heat. In 1965, Radioastronomers Arno Penzias and Robert Wilson discovered a 2.725 degree Kelvin (-454.765 degree Fahrenheit, -270.425 degree Celsius) Cosmic Microwave Background radiation (CMB) which pervades the observable universe. This is thought to be the remnant which scientists were looking for. Penzias and Wilson shared in the 1978 Nobel Prize for Physics for their discovery.
- Finally, the abundance of the “light elements” Hydrogen and Helium found in the observable universe are thought to support the Big Bang model of origins.
Source & For Further Reading: big-bang Continue reading “Big Bang Theory”
বড় ভালবাসি বুঝি আমি তারে,
বড় ভালবাসি, আগলে রাখি এই বাহুডোরে;
সে যে আমার দৈত স্বত্তা, আমার মনের পশু ,
হিংস্র হুংকারে গর্জায় দিনমান, বুঝাতে পারিনা কিছু
অশুভ, হিংসা, কুৎসা, লোভ লালন করে সে পশু;
কাতর আমি, ছেড়ে দিতে তারে কাদিয়া উঠিছে প্রাণ,
দোয়া মাঙ সবে, যেন এই পশুটি মোর দিতে পারি কোরবান ।।
………কোরবানী হোক সবার পশুত্বের, সবাইকে ঈদের শুভেচ্ছা
For four decades, the Landsat program has been documenting Earth from space. Satellites gather light from both visible and invisible parts of the electromagnetic spectrum to craft detailed images including human, biological, and geological details.