Picture of the day

[aspundir]

OBSERVING MARS IN 1926






In this photo from 1926, we see George A. Van Biesbroeck (1880-1974), an astronomer at Yerkes Observatory, observing Mars when it approached close to the Earth that year. Van Biesbroeck is shown using the observatory’s 40 inch refracting telescope, the largest of its kind in the world.
A refracting or refractor telescope is a type of optical telescope that uses a lens as its objective to form an image. The refracting telescope design was originally used in spy glasses and astronomical telescopes but is also used for long focus camera lenses. Although large refracting telescopes were very popular in the second half of the 19th century, for most research purposes the refracting telescope has been superseded by the reflecting telescope.

[dipu]

nice ...............

[rajnish manga]

अच्छी वैज्ञानिक जानकारी के लिए आभार प्रकट करता हूँ, पुंडीर जी. चित्र के लिए विशेष धन्यवाद.

[rajnish manga]

पुण्डीर जी, भविष्य में भी इसी प्रकार की रोचक एवं ज्ञानवर्धक जानकारी देते रहें, कृपया.

[aspundir]

Originally Posted by dipu

nice ...............

Originally Posted by rajnish manga

अच्छी वैज्ञानिक जानकारी के लिए आभार प्रकट करता हूँ, पुंडीर जी. चित्र के लिए विशेष धन्यवाद.

Originally Posted by rajnish manga

पुण्डीर जी, भविष्य में भी इसी प्रकार की रोचक एवं ज्ञानवर्धक जानकारी देते रहें, कृपया.

[aspundir]

OUT FOR A FAMILY STROLL

In this majestic photo we see a mother and baby Sperm whale swimming in the ocean. The Sperm whale (Physeter macrocephalus) is the largest of the toothed whales. Its name derives from a waxy liquid called spermaceti, found in its enormous head. The sperm whale is also known as the cachalot.
Mature males average at 16 metres (52 ft) in length but can reach 20.5 metres (67 ft), with the head representing up to one-third of the animal’s length. The sperm whale feeds primarily on giant and colossal squid. Plunging to 3 kilometres (9,800 ft) for prey, it is the deepest diving mammal.
Its clicking vocalization, a form of echolocation and communication, can be as loud as 230 decibels underwater, making it the loudest sound produced by any animal. It also has the largest brain of any animal on Earth, more than five times heavier than a human’s.

[aspundir]

Crimson Skies and Mammatus Clouds




In this amazing photo, we see crimson mammatus clouds over Citi Field in Queens, New York. The photograph of the intense storm was taken before the game on June 26, 2009 by Flickr user beau-dog.
Citi Field is the home baseball park of the New York Mets. It was completed in 2009 as a replacement for the adjacent Shea Stadium which opened in 1964.
Mammatus, also known as mammatocumulus (meaning “mammary cloud” or “breast cloud”), is a meteorological term applied to a cellular pattern of pouches hanging underneath the base of a cloud. The name mammatus is derived from the Latin mamma (meaning “udder” or “breast”).
Mammatus are most often associated with the anvil cloud and also severe thunderstorms. True to their ominous appearance, mammatus clouds are often harbingers of a coming storm or other extreme weather system. Typically composed primarily of ice, they can extend for hundreds of miles in each direction and individual formations can remain visibly static for ten to fifteen minutes at a time. While they may appear foreboding they are merely the messengers – appearing around, before or even after severe weather.

[aspundir]

LITTLE HOUSE ON THE WATER

A tiny house on the Drina River, near Bajina Basta, a small town in Western Serbia. The Drina is a 346 km long river that forms much of the border between Bosnia and Herzegovina and Serbia. It is the longest tributary of the Sava River and the longest karst river in the Dinaric Alps.

[dipu]

[dipu]