A cosmic conversation

This image from Hubble’s Wide Field Camera 3 (WFC3) shows a spiral galaxy NGC 5917, perhaps best known for its intriguing interactions with its neighbouring galaxy MCG-01-39-003 (not visible here, but located off the bottom right of the frame — as seen here).

Mass is often confused with weight, but they are very different things. Mass is the very substance of an object and is something one always has, no matter the location. If you fly to the Moon and experience low-gravity conditions, your mass has not changed at all. What has actually changed is your weight, because weight is a force caused by the gravitational attraction of another massive body. Gravity is how objects with mass “talk” to one another. People do weigh less on the Moon, but not because they have lost any body mass — the mass of the Moon is less than that of the Earth, so it exerts a smaller gravitational pull on them.

Understanding mass is vital when it comes to understanding why objects behave the way they do in space. Without mass “talking” via gravity, the planets would not orbit the Sun, and galaxies would not interact as NGC 5917 does with its neighbour. Galaxy interactions can lead to very interesting effects; the galaxies can steal mass — in form of stars, dust and gas — from one another, distort and warp one another’s shape, or trigger immense waves of new star formation. Sometimes, a galactic duo interact so strongly that they end up colliding and merging completely. Unfortunately, if NGC 5917 is destined to merge with its celestial neighbour, it will happen much too far into the future for us to enjoy the spectacle.

Credit:

ESA/Hubble & NASA

About the Image

Id:potw1718a
Type:Observation
Release date:1 May 2017, 06:00
Size:3523 x 2266 px

About the Object

Name:NGC 5917
Type:Local Universe : Galaxy : Type : Interacting
Constellation:Libra
Category:Galaxies

Image Formats

Large JPEG
1.9 MB
Screensize JPEG
143.7 KB

Zoomable


Wallpapers

1024x768
193.6 KB
1280x1024
323.7 KB
1600x1200
468.1 KB
1920x1200
540.2 KB
2048x1536
796.9 KB

Coordinates

Position (RA):15 21 32.89
Position (Dec):-7° 22' 42.57"
Field of view:2.33 x 1.50 arcminutes
Orientation:North is 32.5° left of vertical

Colours & filters

BandWavelengthTelescope
Optical
V
555 nm Hubble Space Telescope
WFC3
Optical
I
814 nm Hubble Space Telescope
WFC3
Infrared
H
1.6 μm Hubble Space Telescope
WFC3
Optical
I
814 nm Hubble Space Telescope
WFC3
Optical
Very Broad
350 nm Hubble Space Telescope
WFC3

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