Axar.az
UP
23 August 2017


Hubble's glittering Frisbee Galaxy

Home page Science
12 Punto 14 Punto 16 Punto 18 Punto

This image from Hubble’s Wide Field Camera 3 (WFC3) shows a section of NGC 1448, a spiral galaxy located about 50 million light-years from Earth in the little-known constellation of Horologium (The Pendulum Clock).

We tend to think of spiral galaxies as massive and roughly circular celestial bodies, so this glittering oval does not immediately appear to fit the visual bill. What’s going on?

Imagine a spiral galaxy as a circular frisbee spinning gently in space. When we see it face on, our observations reveal a spectacular amount of detail and structure — a great example from Hubble is the telescope’s view of Messier 51, otherwise known as the Whirlpool Galaxy. However, the NGC 1448 frisbee is very nearly edge-on with respect to Earth, giving it an appearance that is more oval than circular. The spiral arms, which curve out from NGC 1448’s dense core, can just about be seen.

Although spiral galaxies might appear static with their picturesque shapes frozen in space, this is very far from the truth. The stars in these dramatic spiral configurations are constantly moving as they orbit around the galaxy’s core, with those on the inside making the orbit faster than those sitting further out.

This makes the formation and continued existence of a spiral galaxy’s arms something of a cosmic puzzle, because the arms wrapped around the spinning core should become wound tighter and tighter as time goes on — but this is not what we see. This is known as the winding problem.

Date
2017.03.20 / 21:19
Author
Axar.az
Comments
Загрузка...
See also

Mossad chief to accompany Netanyahu on official visit

Turkey will not allow PYD to germinate in Afrin

Poroshenko seeks to discuss alleged nuclear

Lebanon Interested in Russian Buggies

Four gunmen killed in counter-terror operation in Russia

Netanyahu meets with Putin

US cuts withholds $290 million from Egypt over rights

The Kremlin keeps Yerevan in this wetland cause of...

Trump’s South Asia strategy is ‘unacceptable'

Japan diplomats hope to solve Kuril Islands issue

Latest
 
Xocalı soyqırımı — 1992-ci il Bağla
Bize yazin Bağla
ArxivBağla