Editing Very-long-baseline interferometry (section)

== Scientific results ==
{{More citations needed section|date=March 2019}}
[[File:Very Long Baseline Interferometry.ogv|thumb|350px|Geodesist Chopo Ma explains some of the geodetic uses of VLBI.]]

Some of the scientific results derived from VLBI include:

*High resolution radio imaging of cosmic radio sources.
*Imaging the surfaces of nearby stars at radio wavelengths (see also [[astronomical interferometer|interferometry]]) &ndash; similar techniques have also been used to make infrared and optical images of stellar surfaces.
*Definition of the [[International Celestial Reference Frame|celestial reference frame]].<ref>{{cite web |url=http://hpiers.obspm.fr/icrs-pc/newwww/icrf/index.php |title=The ICRF |website=IERS ICRS Center |publisher=Paris Observatory |access-date=25 December 2018 }}</ref><ref>{{cite web | url = https://aa.usno.navy.mil/faq/ICRS_doc |title=International Celestial Reference System (ICRS) |website=United States Naval Observatory |access-date=6 September 2022 }}</ref>
*Measurement of the acceleration of the [[Solar System]] toward the center of [[Milky Way|the Milky Way]].<ref> {{ Citation | last1 = Charlot | first1 = P. | last2 = Jacobs | first2 = C. S. | last3 = Gordon | first3 = D. | last4 = Lambert | first4 = S. | display-authors = etal | date = 2020 | title = The third realization of the International Celestial Reference Frame by very long baseline interferometry | journal = Astronomy and Astrophysics | volume = 644 | pages = A159 | doi = 10.1051/0004-6361/202038368 | arxiv = 2010.13625 | bibcode = 2020A&A...644A.159C | s2cid = 225068756 }} </ref>{{rp|pp=6-7}}
*Motion of the Earth's tectonic plates.
*Regional deformation and local uplift or subsidence.
*[[Earth's orientation parameters]] and [[fluctuations in the length of day]].<ref>{{cite book |editor1-last=Urban |editor1-first=Sean E. |editor2-last=Seidelmann |editor2-first=P. Kenneth |title=Explanatory Supplement to the Astronomical Almanac, 3rd Edition |year=2013 |publisher=University Science Books |location=Mill Valley, California |isbn=978-1-891389-85-6 |pages=176–7 }}</ref>
*Maintenance of the [[terrestrial reference frame]].
*Measurement of [[gravitational force]]s of the [[Sun]] and [[Moon]] on the Earth and the deep structure of the Earth.
*Improvement of atmospheric models.
*Measurement of the fundamental [[speed of gravity]].
*The tracking of the [[Huygens probe]] as it passed through [[Titan (moon)|Titan's]] atmosphere, allowing wind velocity measurements.<ref>{{cite web |url=http://www.esa.int/Our_Activities/Space_Science/Cassini-Huygens/Radio_astronomers_confirm_Huygens_entry_in_the_atmosphere_of_Titan |title=Radio astronomers confirm Huygens entry in the atmosphere of Titan |date=January 14, 2005 |website=European Space Agency |access-date=March 22, 2019 }}</ref>
*First imaging of a supermassive black hole.<ref name="APJL-20190410" /><ref>{{cite web |url=https://www.science.org/content/article/black-hole |title=For the first time, you can see what a black hole looks like |last1=Clery |first1=Daniel |date=April 10, 2019 |website=Science |publisher=AAAS |access-date=April 10, 2019 }}</ref>