File:NGC1052-DF2 Compass Image (2021-025).png

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NGC1052-DF2 Compass Image

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Description	English: NGC1052-DF2 Compass Image
Date	Taken in 2021
Source	NGC1052-DF2 Compass Image
Author	SCIENCE: NASA, ESA, STScI, Zili Shen (Yale), Shany Danieli (IAS), Pieter van Dokkum (Yale) IMAGE PROCESSING: Alyssa Pagan (STScI)
Other versions	TIF version

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This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.

The material was created for NASA by Space Telescope Science Institute under Contract NAS5-26555, or for ESA by the Hubble European Space Agency Information Centre. Copyright statement at hubblesite.org or 2008 copyright statement at spacetelescope.org.

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File:NGC1052-DF2 Compass Image (2021-025).tif

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Author	Space Telescope Science Institute Office of Public Outreach
Image title	This Hubble Space Telescope snapshot reveals an unusual galaxy thatresearchers call a“see-through galaxy.” The giant cosmic cottonball is so diffuse and its ancient stars are so spread out thatdistant galaxies in the background can be seen through it.Called an ultra-diffuse galaxy, this oddball is almost as wideas the Milky Way, but it contains only 1/200th the number of starsas our galaxy. The ghostly galaxy doesn’t appear to have anoticeable central region, or even spiral arms and a disk.Researchers calculated a more accurate distance to the galaxy,named NGC 1052-DF2, or DF2, by using Hubble to observe about5,400 aging red giant stars. Red giant stars all reach the samepeak brightness, so they are reliable yardsticks to measuredistances to galaxies.The research team estimates that DF2 is 72 million light-years fromEarth. They say this distance measurement solidifies their claimthat DF2 lacks dark matter, the invisible glue that makes up thebulk of the universe’s contents. The galaxy contains at most 1/400ththe amount of dark matter that the astronomers had expected.The observations were taken between December 2020 and March 2021 withHubble’s Advanced Camera for Surveys.
Short title	NGC1052-DF2 Compass Image
Credit/Provider	NASA, ESA, Z. Shen and P. van Dokkum (Yale University), andS. Danieli (Institute for Advanced Study)
Headline	Hubble Captures a Ghostly Galaxy
Source	STScI
Usage terms	http://hubblesite.org/copyright/
Date and time of data generation	17 June 2021
Color space	Uncalibrated
Exif version	2.31
Image width	2,769 px
Image height	2,034 px
Bits per component	8 8 8
Height	2,034 px
Width	2,769 px
Pixel composition	RGB
Number of components	3
Horizontal resolution	72 dpi
Vertical resolution	72 dpi
Contact information	outreach@stsci.edu http://hubblesite.org 3700 San Martin Drive Baltimore, MD, 21218 USA 410-338-4444
Keywords	NGC1052-DF2
Date and time of digitizing	03:51, 13 May 2021
Software used	Adobe Photoshop 22.2 (Macintosh)
Date metadata was last modified	11:46, 11 June 2021
File change date and time	11:06, 11 June 2021
Unique ID of original document	xmp.did:0f1c4570-b903-4f34-81c7-ad79061be827

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