Saturday, August 30, 2014

Our Solar System


Ancient astronomers observed points of light that appeared to move among the stars.The Solar System comprises the Sun and the objects that orbit it.The Solar System formed 4.6 billion years ago from the gravitational collapse of a giant molecular cloud. The vast majority of the system's mass is in the Sun, with most of the remaining mass contained in Jupiter. The four smaller inner planets, Mercury, Venus, Earth and Mars, also called the terrestrial planets, are primarily composed of rock and metal. The four outer planets, called the gas giants, are substantially more massive than the terrestrials. The two largest, Jupiter and Saturn, are composed mainly of hydrogen and helium; the two outermost planets, Uranus and Neptune, are composed largely of substances with relatively high melting points (compared with hydrogen and helium), called ices, such as water, ammonia and methane, and are often referred to separately as "ice giants". All planets have almost circular orbits that lie within a nearly flat disc called the ecliptic plane.

Monday, August 25, 2014

Madagascar Rainforests


Madagascar, is an island country in the Indian Ocean, off the coast of Southeast Africa. The nation comprises the island of Madagascar (the fourth-largest island in the world), as well as numerous smaller peripheral islands. Following the prehistoric breakup of the supercontinent Gondwana, Madagascar split from India around 88 million years ago, allowing native plants and animals to evolve in relative isolation. Consequently, Madagascar is a biodiversity hotspot; over 90 percent of its wildlife is found nowhere else on Earth. The island's diverse ecosystems and unique wildlife are threatened by the encroachment of the rapidly growing human population and other environmental threats. Madagascar is home to some of the richest rainforests on Earth. Well over half of Madagascar's species are found in these forests which lie on the east coast of the island. It is estimated that only a third of the original lowland forest remains intact. Seven percent of the lowland forests that remain are protected in national parks and reserves.

Monday, July 28, 2014

Buddhist Temples In Thailand


Thai people who originally lived in southwestern China migrated into mainland Southeast Asia over a period of many centuries. The oldest known mention of their existence in the region by the exonym Siamese is in a 12th-century A.D. inscription at the Khmer temple complex of Angkor Wat in Cambodia, which refers to syam, or "dark brown", people.The ancient Siamese kingdoms of Thailand maintained an independent existence throughout their thousand year history, and were never conquered by foreign powers.There are a total of 40,717 Buddhist temples (Thai: Wat) in Thailand as of 31 December 2004, of which 33,902 are in current use, according to the Office of National Buddhism.

Friday, July 25, 2014

Animal Seals


Seals closest living relatives are bears and musteloids (weasels, raccoons and skunks). Molecular evidence supports them as a monophyletic lineage (descended from one ancestral line).Males live to about 18 years while females live to approximately 24 years. Most species prefer the colder waters of the Northern and Southern Hemispheres. They spend most of their lives in the water, but come ashore to mate, give birth, molt or escape from predators, like sharks and killer whales. They feed largely on fish and marine invertebrates; but a few, like the leopard seal, feed on large vertebrates, such as penguins and other seals.

Sunday, June 29, 2014

Firefly



Credit- en.wikipedia.org
Lampyridae is a family of insects in the beetle order Coleoptera. They are winged beetles, and commonly called fireflies or lightning bugs for their conspicuous crepuscular use of bioluminescence to attract mates or prey. Fireflies produce a "cold light", with no infrared or ultraviolet frequencies. This chemically produced light from the lower abdomen may be yellow, green, or pale red, with wavelengths from 510 to 670 nanometers.About 2,000 species of firefly are found in temperate and tropical environments.

Sunday, June 22, 2014

Solstice


Credit image - scifun.edu.ac.uk
A solstice is an astronomical event that occurs twice each year as the Sun reaches its highest or lowest excursion relative to the celestial equator on the celestial sphere. The solstices, together with the equinoxes, are connected with the seasons. In many cultures the solstices mark either the beginning or the midpoint of winter and summer.

Saturday, May 24, 2014

Machu Picchu Peru



Credit- en.wikipedia.org
Machu Picchu was built as an estate for the Inca emperor Pachacuti (1438–1472). Often mistakenly referred to as the "Lost City of the Incas", it is perhaps the most familiar icon of Inca civilization.

The Incas built the estate around 1450, but abandoned it a century later at the time of the Spanish Conquest. Although known locally, it was unknown to the outside world before being brought to international attention in 1911 by the American historian Hiram Bingham. Since then, Machu Picchu has become an important tourist attraction.

Machu Picchu was declared a Peruvian Historical Sanctuary in 1981 and a UNESCO World Heritage Site in 1983. In 2007, Machu Picchu was voted one of the New Seven Wonders of the World in a worldwide Internet poll.