Profile

Cover photo
Niki Giannandrea
Attended University of Chieti
Lives in Pescara, PE, Italia
232 followers|30,438 views
AboutPostsPhotosYouTube

Stream

Niki Giannandrea

Shared publicly  - 
 
 
Matter of Scale

One of the fascinating things about black holes is their scale. In principle, black holes are determined by density. If matter reaches a critical density, then it will collapse under its own weight. It’s a collapse nothing can prevent, not even the strongest repulsive forces in the nucleus of an atom.

When talking about black holes we can imagine the Sun collapsing to the size of a city, or the Earth squeezed to the size of a marble, but neither the Earth or Sun are massive enough for that to happen. Black holes occur when more massive stars explode as supernovae, or when the centers of proto-galaxies collapse into supermassive black holes.

But as strange as they are, we know black holes exist. We see evidence of them throughout the universe. But sometimes it’s fun just to sit back and take in the tremendous matters of scale that black holes represent, as seen by the video below.
1
mohsen pk's profile photo
 
Hi niki
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
Stars and Dust Pillars in NGC 7822 from WISE
Image Credit: WISE, IRSA, +NASA; Processing & Copyright : Francesco Antonucci
http://apod.nasa.gov/apod/ap141201.html

Hot, young stars and cosmic pillars of gas and dust seem to crowd into NGC 7822. At the edge of a giant molecular cloud toward the northern constellation Cepheus, this glowing star forming region lies about 3,000 light-years away. Within the nebula, bright edges and complex dust sculptures dominate this detailed skyscape taken in infrared light by NASA's Wide Field Infrared Survey Explorer (WISE) satellite. The atomic emission by the cluster's gas is powered by energetic radiation from the hot stars, whose powerful winds and light also sculpt and erode the denser pillar shapes. Stars could still be forming inside the pillars by gravitational collapse, but as the pillars are eroded away, any forming stars will ultimately be cut off from their reservoir of star stuff. This field spans around 40 light-years at the estimated distance of NGC 7822.
1
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
Earth's Greatest Hits: 20 Years of #asteroids that broke up in our atmosphere: http://go.nasa.gov/1wzbyHN
1
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
Definizione Patologia delle ghiandole surrenali caratterizzata da eccesso di produzione dell’ormone aldosterone. Epidemiologia Malattia rara, colpisce prevalentemente il sesso femminile tra i 30 e i 50 anni di età. L’introduzione dell’uso del rapporto... #endocrinologia #medicinainterna
1
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
A Sagittarius Starscape
Image Credit & Copyright: Terry Hancock (Down Under Observatory)
http://apod.nasa.gov/apod/ap140905.html

This rich starscape spans nearly 7 degrees on the sky, toward the Sagittarius spiral arm and the center of our Milky Way galaxy. A telescopic mosaic, it features well-known bright nebulae and star clusters cataloged by 18th century cosmic tourist Charles Messier. Still popular stops for skygazers M16, the Eagle (far right), and M17, the Swan (near center) nebulae are the brightest star-forming emission regions. With wingspans of 100 light-years or so, they shine with the telltale reddish glow of hydrogen atoms from over 5,000 light-years away. Colorful open star cluster M25 near the upper left edge of the scene is closer, a mere 2,000 light-years distant and about 20 light-years across. M24, also known as the Sagittarius Star Cloud, crowds in just left of center along the bottom of the frame, fainter and more distant Milky Way stars seen through a narrow window in obscuring fields of interstellar dust.
1
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
Interesting info-graphics providing a little perspective to the number of people killed by animals. Based on these numbers, the infamous sharks are actually the kindest animals!

I must say that it is a little ironic since technically speaking Humans are the deadliest animal on Earth in terms of number of animals killed by an animal.

Info-graphics source: http://www.gatesnotes.com/Health/Most-Lethal-Animal-Mosquito-Week
1
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
I have been selected as one of the winners of an Astrophotography Contest by the NEW International Astronomy magazine First Light Magazine. This is my winning entry, congratulations to the other winners and thanks to all at First Light!!
https://www.facebook.com/FirstLightMagazine/photos/a.1497961847137789.1073741828.1441542406113067/1516421208625186/?type=1&theater
2
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
How HIV Destroys Immune Cells.

HIV leads to AIDS primarily because the virus destroys essential immune cells called CD4 T cells, but precisely how these cells are killed has not been clear. Two papers published simultaneously today (December 19) in Nature and Science reveal the molecular mechanisms that cause the death of most CD4 T cells in lymphoid tissues, the main reservoir for such cells, during infection.

http://goo.gl/aFiHBv

Video: This 3D medical animation shows the function of white blood cells in normal immunity. It also portrays how the human immunodeficiency virus (HIV) affects the immune system and causes acquired immunodeficiency syndrome (AIDS). Common types of antiretroviral medications used to treat HIV and AIDS are also shown.
1
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
Rischio infettivo delle lenti a contatto: il ruolo della manutenzione e l'efficacia dei disinfettanti Secondo le stime attuali, i portatori di lenti a cont
1
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
Letture soft in notturna #medicina  
 ·  Translate
Pubblicità Anatomia del Ganglio Stellato Il Ganglio Stellato (denominazione dovuta alla particolare forma stellata) è un ganglio nervoso del sistema ortosimpatico a sito all’altezza della settima vertebra cervicale. Normalmente si rinvengono tre gangli cervicali (superiore, medio... #anatomia
2
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
M6: The Butterfly Cluster
Image Credit & Copyright: Marco Lorenzi
http://apod.nasa.gov/apod/ap140903.html

To some, the outline of the open cluster of stars M6 resembles a butterfly. M6, also known as NGC 6405, spans about 20 light-years and lies about 2,000 light years distant. M6, pictured above, can best be seen in a dark sky with binoculars towards the constellation of the Scorpion (Scorpius), coving about as much of the sky as the full moon. Like other open clusters, M6 is composed predominantly of young blue stars, although the brightest star is nearly orange. M6 is estimated to be about 100 million years old. Determining the distance to clusters like M6 helps astronomers calibrate the distance scale of the universe.
3
Add a comment...

Niki Giannandrea

Shared publicly  - 
 
 
SN 1006 Supernova Remnant
Image Credit: +NASA, +European Space Agency, ESA, Zolt Levay (STScI)
http://apod.nasa.gov/apod/ap140712.html

A new star, likely the brightest supernova in recorded human history, lit up planet Earth's sky in the year 1006 AD. The expanding debris cloud from the stellar explosion, found in the southerly constellation of Lupus, still puts on a cosmic light show across the electromagnetic spectrum. In fact, this composite view includes X-ray data in blue from the Chandra Observatory, optical data in yellowish hues, and radio image data in red. Now known as the SN 1006 supernova remnant, the debris cloud appears to be about 60 light-years across and is understood to represent the remains of a white dwarf star. Part of a binary star system, the compact white dwarf gradually captured material from its companion star. The buildup in mass finally triggered a thermonuclear explosion that destroyed the dwarf star. Because the distance to the supernova remnant is about 7,000 light-years, that explosion actually happened 7,000 years before the light reached Earth in 1006. Shockwaves in the remnant accelerate particles to extreme energies and are thought to be a source of the mysterious cosmic rays.
1
Stalin Muthu's profile photo
 
Like
Add a comment...
Work
Occupation
Medical Doctor
Skills
Internal medicine; Cardiology
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Pescara, PE, Italia
Education
  • University of Chieti
    Medicine, 2006 - 2012
Basic Information
Gender
Male