Explorer 21 (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Explorer 21" in English language version.

refsWebsite

Global rank English rank

9nasa.gov

75^th place

83^rd place

1planet4589.org

8,665^th place

6,411^th place

1unoosa.org

low place

1flightglobal.com

223^rd place

162^nd place

1newspapers.com

55^th place

36^th place

1web.archive.org

1^st place

1colostate.edu

3,616^th place

2,556^th place

colostate.edu

rammb.cira.colostate.edu

"Explorer-series reference images". Retrieved 4 July 2021.

flightglobal.com

"NASA'S YEAR". Flight International. Retrieved 9 June 2018.

nasa.gov

nssdc.gsfc.nasa.gov

"Trajectory: Explorer 21 (IMP-B) 1964-060A". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.
"Display: Explorer 21 (IMP-B) 1964-060A". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.
"Experiment: Cosmic-Ray Range versus Energy Loss". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.
"Experiment: Cosmic Rays". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.
"Experiment: Faraday Cup". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.
"Experiment: Fluxgate Magnetometer". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.
"Experiment: Ion Chamber and Geiger–Müller Counters". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.
"Experiment: Retarding Potential Analyzer". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.
"Experiment: Solar Wind Protons". NASA. 28 October 2021. Retrieved 7 November 2021. This article incorporates text from this source, which is in the public domain.

newspapers.com

"Explorer-21 Satellite Falls Far Short Of Orbital Goal". The Palm Beach Post. Vol. 56, no. 202. UPI. 5 October 1964. p. 8. Archived from the original on 25 January 2024. Retrieved 9 June 2018 – via Newspapers.com.

planet4589.org

"Jonathan's Space Report". 21 July 2021. Retrieved 7 November 2021.

unoosa.org

"Letter dated 22 December 1964 from the Permanent Representative of the United States of America addressed to the Secretary-General" (PDF). COMMITTEE ON THE PEACEFUL USES OF OUTER SPACE (64-28156). Retrieved 5 December 2022.

web.archive.org

"Explorer-21 Satellite Falls Far Short Of Orbital Goal". The Palm Beach Post. Vol. 56, no. 202. UPI. 5 October 1964. p. 8. Archived from the original on 25 January 2024. Retrieved 9 June 2018 – via Newspapers.com.