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	Re: 2020: On this day . . . Mona - Astronomy #933395 11/19/20 11:16 AM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 1918 - November 19th - Dutch astronomer and mathematician Hendrik C. van de Hulst was born. Hulst predicted the existence of the 21 cm hyperfine line of neutral interstellar hydrogen. When it was discovered, he worked with Jan Oort and others to use radio astronomy to map out the neutral hydrogen in the Milky Way, which first revealed our galaxy's spiral structure.

	Re: 2020: On this day . . . Mona - Astronomy #933396 11/19/20 11:18 AM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 1969 - November 19th - Apollo 12 astronauts landed on the Moon in the southeastern part of the Ocean of Storms. Mission commander Charles "Pete" Conrad and Lunar Module Pilot Alan L. Bean carried out lunar surface tasks, Command Module Pilot Richard F. Gordon remained in lunar orbit.

	Re: 2020: On this day . . . Mona - Astronomy #933402 11/20/20 10:27 AM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 1932 - November 19th - American astronomer Eleanor Francis “Glo” Helin was born. Helin was active in planetary science and astronomy at Cal Tech and NASA's Jet Propulsion Laboratory for over three decades. Among her many achievements were the discovery of hundreds of asteroids and several comets.

	Re: 2020: On this day . . . Mona - Astronomy #933403 11/20/20 10:34 AM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 2005 - November 19th - the Hayabusa spacecraft of Japan Aerospace Exploration Agency (JAXA) became the first ever to lift off from an asteroid. It had collected a sample of material from near-Earth asteroid 25143 Itokawa, which it then returned to Earth.

	Re: 2020: On this day . . . Mona - Astronomy #933404 11/20/20 10:40 AM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 1889 - November 20th - American astronomer Edwin Hubble was born. He showed that the Universe was much bigger than our own Galaxy, and his observations provided evidence for an expanding universe. The Hubble Space Telescope is named for him.

	Re: 2020: On this day . . . Mona - Astronomy #933407 11/21/20 10:44 AM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 1998 - November 20th - the Zarya module was launched from Baikonur Cosmodrome, Kazakhstan. Zarya was the first module of the International Space Station. A much expanded space station is still operating with crews made up of astronauts from many nations.

	Re: 2020: On this day . . . Mona - Astronomy #933409 11/22/20 09:19 AM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 2004 - November 20th - NASA's Swift Gamma-Ray Burst Mission was launched. (It's now called the Neil Gehrels Swift Observatory.) The mission, with international participation, was designed to help solve the mystery of gamma-ray bursts.

	Re: 2020: On this day . . . Mona - Astronomy #933412 11/23/20 09:45 AM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 1977 - November 23rd - Meteosat-1 was launched by EUMETSAT (a European intergovernmental agency). Meteosat-1 was the first of the first generation of Meteosat satellites, which have provided continuous and reliable meteorological observations from space to a large user community.

	Re: 2020: On this day . . . Mona - Astronomy #933417 11/25/20 12:49 PM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 1816 - November 25th - American lawyer, astronomer and pioneering astrophotographer Lewis Morris Rutherfurd was born. After practicing law for a number of years, Rutherfurd gave it up for astronomy. He was a pioneer of astrophotography, inventing the first telescope designed specifically for astrophotography. With the telescope he made high quality images of the Sun, Moon and planets as well as star clusters and stars down to around fifth magnitude. Rutherfurd was an associate of the Royal Astronomical Society, and one of the original members of the National Academy of Sciences.

	Re: 2020: On this day . . . Mona - Astronomy #933418 11/25/20 12:51 PM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 2011 - November 26th - the Mars Science Laboratory rover Curiosity was launched. Curiosity is still exploring Mars.