What is Sirius?

-
Sirius is the brightest star in the sky. It is at a distance of 9.5 light years from the Earth. It is also known as the Dog Star because it lies in the constellation of Canis Major, the Greater Dog. Sirius is actually a binary star and it is made up of two stars that orbit around each other. Only the brighter of the two can be seen with the naked eye. Sirius was important in ancient Egypt before the calenders were developed. The appearance of Sirius coincided with the annual flooding of river Nile.

Comments

Post a Comment

Popular Posts

Why do Some Plants Lose their Leaves in Autumn?

-
Image
T o survive in the cold during winters, the deciduous trees shed their leaves. They live leafless for many months, thereby conserving water and avoiding frost damage. As the temperature begins to fall at the onset of autumn , the soil gets too cold for most broad based leaves to take up enough water. To avoid further loss of water by transpiration, the trees begin to shed their leaves . The trees begin to withdraw the chlorophyll before the leaves are shed, imparting various brilliant colours to them depending upon the pigment left behind . Some evergreen trees like pine never lose their leaves even though they inhabit colder regions. They have thin, needle like leaves that have low transpiration rate and, hence very low water loss . 
Read more

What do X-rays Show?

-
Image
X-rays are special photographs which are needed to detect any injury or damage inside the body. These photographs show through the soft tissues of the body, but not the bones. They show if a bone has been damaged or broken and also reveal if some organs like the lungs and heart are working properly .
Read more

How do Trawlers Fish?

-
Image
T rawlers are vessels that fish with a large net called trawl. The trawl is a bag-like net and could be over 100 metres long. It is attached to the rear part of the vessel with long ropes, which can go down to enormous depths upto 1500 metres or more. The fish are swept in at the wide, open end and then get trapped at the narrower closed end. When the net is full of fish, powered winches bring it back to the vessel. Modern trawlers are big factories in themselves . The fish are automatically gutted, filleted and frozen there on board .
Read more

Quantum Theory

-
Image
Quantum Theory Full Documentary HD https://www.youtube.com/watch?v=A-iB5iEy2Kc&t=1183s quantum hypothesis Posted by: Margaret Rouse Contributor(s): Ivy Wigmore Quantum hypothesis is the hypothetical premise of current material science that clarifies the nature and conduct of issue and vitality on the nuclear and subatomic dimension. The nature and conduct of issue and vitality at that dimension is at times alluded to as quantum material science and quantum mechanics. In 1900, physicist Max Planck introduced his quantum hypothesis to the German Physical Society. Planck had tried to find the reason that radiation from a sparkling body changes in shading from red, to orange, and, at last, to blue as its temperature rises. He found that by making the suspicion that vitality existed in individual units similarly that issue does, instead of similarly as a steady electromagnetic wave - as had been once in the past accepted - and was consequently quantifiable, he could...
Read more

Why do Flowers have Bright Colours?

-
Image
F lowers have male and female organs, i.e., anther and stigma, and they perform the function of producing seeds. The transfer of pollen from an anther to a stigma is known as pollination and is the first stage in the reproduction of plants. The flowers, in many cases, are pollinated by insects and to attract the insects , flowers have bright colours and often produce sweet scent and nectar. The flowers have bright colours to attract the insects. While drinking the nectar of the flower, an insect picks up pollen on its body and when it visits another flower, it brushes some of this pollen on to the stigma , thereby making cross pollination. Insect pollinated flowers are usually blue , yellow, pink or white. In some regions, birds, bats, rodents and marsupials help in pollinating flowers. These flowers too, are very brightly coloured.
Read more