Delwedd:M101 UIT.gif - Wicipedia

# Delwedd:M101 UIT.gif

### Oddi wrth Wicipedia, y gwyddoniadur rhydd.

- Delwedd
- Hanes y ddelwedd
- Cysylltiadau'r ddelwedd

Size of this preview: 600 × 600 pixel
Image in higher resolution (779 × 779 pixel, file size: 231 KB, MIME type: image/gif)

Gall y ffeil hon gael ei defnyddio gan nifer o brosiectau eraill.

## [edit] Beschreibung

This ultraviolet image of the giant spiral galaxy Messier 101 (M101) was obtained by the Ultraviolet Imaging Telescope during the Astro-2 mission of the Space Shuttle Endeavour.

M101 is an Sc-type galaxy, meaning a spiral galaxy with a relatively small central bulge and a system of spiral arms that is not tightly wound. At a distance of about 16 million light years, it is considered relatively close to the Earth.

M101 is known to contain many giant HII regions, meaning huge glowing nebulae shine as a result of ultraviolet radiation from the massive stars within them. The UIT images will be used to determine the far-ultraviolet energy outputs of these stars and nebulae. Also, the astronomers will study the ages of the nebulae, their dust contents, and the "initial mass functions" of their stars, meaning the relative numbers of stars of different masses when they first formed in the nebulae. This is equivalent to finding the relative numbers of newborn babies of different weights. The investigators will also determine the total mass of all the young massive stars in each HII region or nebula.

## [edit] Source

- http://archive.stsci.edu/uit/project/Astro2/Astro2_pictures.html

## [edit] Licensing

This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

Warnings:

- Use of NASA logos (which include the current "meatball" logo, the old "worm" logo, and the seal) is restricted.
- Materials from the Hubble Space Telescope may be copyrighted if they do not explicitly come from the STScI. [1]
- All materials created by the SOHO probe are copyrighted and require permission for commercial non-educational use. [2]
- Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3]

## Cysylltiadau'r ddelwedd

Mae'r tudalennau isod yn cysylltu i'r ddelwedd hon:

- Messier 101

Wedi dod o "http://cy.wikipedia.org../../../m/1/0/Delwedd%7EM101_UIT.gif_2aa4.html"

##### Views

- Ffeil
- Sgwrs
- Diwygiad cyfoes

##### Chwilio