 | Have we found black holes?
There is now a great deal of indirect astronomical observational evidence for black holes in two mass ranges:
stellar mass black holes with masses of a typical star (4–15 times the mass of our Sun), and
supermassive black holes... | |
| What is Black hole?
A black hole is a concentration of mass great enough that the force of gravity prevents anything from escaping it except through quantum tunneling behavior (known as Hawking Radiation). The gravitational field is so strong that the escape... | |
| Planets
A planet is generally considered to be a relatively large mass of accreted matter in orbit around a star that is not a star itself. The International Astronomical Union (IAU) lists nine planets in our solar system. Since the term "planet"... | |
| What is Constellation?
A constellation is a group of stars visibly related to each other in a particular configuration.
![Orion is a remarkable constellation, visible from most places on the globe (but not always the whole year long).]() | |
| What is Solar wind?
A solar wind is a stream of charged particles (i.e., a plasma) which are ejected from the upper atmosphere of a star. When originating from stars other than the Earth's Sun, it is sometimes called a stellar wind.
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| Age and size of stars
Many stars are between 1 billion and 10 billion years old. Some stars may even be close to 13.7 billion years old, which is the observed age of the universe. (See Big Bang theory and stellar evolution.) They range in size from the tiny... | |
| Nuclear fusion
In physics, nuclear fusion is the process by which two nuclei join together to form a heavier nucleus. It is accompanied by the release or absorption of energy depending on the masses of the nuclei involved. Iron and nickel nuclei have... | |
| Hypothalamus of human brain
In the anatomy of mammals, the hypothalamus is a region of the brain located below the thalamus, forming the major portion of the ventral region of the diencephalon and functioning to regulate certain metabolic processes and other... | |
| What is the Chest?
In hominids, the chest is the region of the body between the neck and the abdomen, along with its internal organs and other contents. It is mostly protected and supported by the ribcage, spine, and shoulder girdle. ![]() | |
| Face
The face is the front part of the human head from forehead to chin including the head, hair, forehead, eyebrow, eyes, nose, cheek, mouth, lips, teeth, skin, and chin. The face is used for facial expressions, appearance and identity... | |
| Hip (anatomy)
In anatomy, the hip is the bony projection of the femur, known as the greater trochanter, and the overlying muscle and fat. The hip joint is the joint between the femur and the acetabulum of the pelvis and its primary function is to... | |
| Belly Button
The umbilicus (commonly called a navel, or belly or tummy button), is essentially a scar caused at birth by the removal of the umbilical cord from a newborn baby. The scar can appear as a depression (sometimes colloquially referred to as... | |
| Mouth
The mouth, also known as the buccal cavity or the oral cavity, is the opening through which an animal or human takes in food. It is usually located in the head, but not always; the mouth of a planarium is in the middle of its belly.
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| Calf muscle
The calf or sura is a pair of muscles -- the gastrocnemius and soleus -- at the back of the lower human leg. The calf muscle is connected to the foot through the Achilles tendon, which acts to plantar flex the foot. so it is used... | |
| Rib cage
In anatomy, ribs (Latin costae) are the long curved bones which form the rib cage. Ribs surround the chest (Latin thorax) of land vertebrates, and protect the lungs, heart, and other internal organs of the thoracic cavity.
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| Elbow-joint
The elbow-joint (Articulatio Cubiti) [Figs. 1,2] is a ginglymus or hinge-joint. The trochlea of the humerus is received into the semilunar notch of the ulna, and the capitulum of the humerus articulates with the fovea on the head of the... | |
| What do you mean by Ear?
An ear is an organ used by an animal to detect sound waves. The term may refer to the entire system responsible for collection and early processing of sound (the beginning of the auditory system), or merely the externally-visible part.... | |
| Shoulder of human
In human anatomy, the shoulder joint is composed of three bones: the clavicle (collarbone), the scapula (shoulder blade), and the humerus (upper arm bone). Two joints facilitate shoulder movement. The acromioclavicular (AC) joint is... | |
| Cerebellum of human brain
The cerebellum (Latin: "little brain") is a region of the brain that plays an important role in the integration of sensory perception and motor output. Many neural pathways link the cerebellum with the motor cortex—which sends information... | |
| Cerebellum of human brain
The cerebellum (Latin: "little brain") is a region of the brain that plays an important role in the integration of sensory perception and motor output. Many neural pathways link the cerebellum with the motor cortex—which sends information... | |
| What is appendix?
In human anatomy, the vermiform appendix (or appendix, pl. appendixes) is a blind ended tube connected to the cecum. It develops embryologically from the cecum. In adults, the appendix averages 10 cm in length but can range from 2-20 cm.... | |
| Gallbladder
The gallbladder (or cholecyst) is a pear-shaped organ that stores bile (or "gall") until the body needs it for digestion. It is connected to the liver and the duodenum by the biliary tract.
![Gall bladder]() | |
| Medulla oblongata of human brain
The medulla oblongata is the lower portion of the brainstem. By anatomical terms of location, it is rostral to the spinal cord and caudal to the pons, which is in turn ventral to the cerebellum. For a human or other bipedal species, this... | |
| Cerebral cortex of human brain
The cerebral cortex is a brain structure in vertebrates, including humans. It is the outermost layer of the cerebrum and has a grey color. (Hence the name "grey matter". Grey matter is formed by neurons and their fibers, and white matter... | |
| A human nose
A nose is a protuberance in vertebrates that houses the nostrils, or nares, which admit and expel air for respiration. In most mammals, it also houses the nosehairs, which catch airborne particles and prevent them from reaching the lungs.... | |
| A Knee in a human body
The knee is a complex, compound, condyloid variety of a synovial joint. It actually comprises two separate joints. The femoro-patellar joint consists of the patella, or "kneecap", a so-called "sesamoid bone" which sits within the tendon... | |
| What is Thyroid Gland?
The thyroid is one of the larger endocrine glands in the body. It is located in the neck and produces hormones, principally thyroxine and triiodothyronine, that regulate the rate of metabolism and affect the growth and rate of function of... | |
| Human brain
The human brain is the center of the central nervous system in humans as well as the primary control center for the peripheral nervous system.
The brain controls "lower" or involuntary activities such as heartbeat, respiration, and... | |
| What is Intestine?
The intestine is the part of the body responsible for extracting nutrition from food. While the stomach's role mainly consists in "breaking" food molecules into nutrients, the intestine allows these nutrients to enter the blood via its... | |
| What is Stomach?
In anatomy, the stomach is an organ in the alimentary canal used to digest food. Generally, the stomach's primary function is not the absorption of nutrients from digested food; this task is usually performed by the intestine. The main... | |