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	Re: 2023 - on this day in the past . . . Mona - Astronomy #938189 07/01/23 06:49 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 1917 – July 1st – the 100" mirror for the Hooker telescope arrived at Mt Wilson Observatory. The Hooker telescope was the biggest in the world for three decades. Edwin Hubble calculated the distance to Andromeda from a Cepheid variable he discovered there with the telescope. It showed Andromeda was a separate galaxy. Hubble and Milton Humason also observed the redshifts of a number of galaxies and found that they were moving away from us. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938192 07/02/23 07:47 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 1985 – July 2nd – the European Space Agency (ESA) launched the Giotto probe to study Halley's Comet. Giotto would be the first spacecraft ever to make close up observations of a comet. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938200 07/03/23 10:56 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 1935 – July 3rd – geologist and Apollo 17 astronaut Harrison Schmitt was born in Santa Rita, New Mexico. Schmitt is the only scientist to have walked on the Moon. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938202 07/04/23 08:55 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 1054 – July 4th – Chinese astronomers observed the supernova explosion that created the Crab Nebula (Messier 1) in the constellation Taurus. The supernova would have occurred some 6500 years before it was observed on Earth, since it's around 6500 light years away. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938203 07/04/23 08:59 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 1868 – July 4th – American astronomer Henrietta Swan Leavitt was born in Lancaster, Massachusetts. Her discovery of the relationship between the period and the luminosity of Cepheid variable stars made possible Edwin Hubble's work on galactic distances. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938204 07/04/23 09:01 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 1997 – July 4th – NASA's Mars Pathfinder landed on Mars. The robotic spacecraft consisted of a lander, renamed the Carl Sagan Memorial Station, and a wheeled robotic rover named Sojourner. It was the first successful Mars rover. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938205 07/04/23 09:08 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 – July 4th – NASA's Deep Impact probe collided with comet Tempel 1. The Deep Impact mission was designed to study the interior composition of the comet Tempel 1 (9P/Tempel) by releasing an impactor into it. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938209 07/05/23 01:34 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 2016 – July 5th – NASA's Juno spacecraft went into polar orbit around Jupiter. The Juno mission is exploring Jupiter, seeking to unlock secrets of the giant planet and our solar system. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938222 07/07/23 06:32 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 2003 – July 7th – NASA's Mars rover Opportunity was launched on a three-month mission. Opportunity was still at work on the red planet until the summer of 2018 when it was unable to recover after a massive planetwide dust storm. .

	Re: 2023 - on this day in the past . . . Mona - Astronomy #938227 07/08/23 06:22 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 2011 – July 8th – space shuttle Atlantis was launched, the final space shuttle mission. By the end of that mission, Atlantis, in its lifetime, had orbited the Earth a total of 4,848 times, traveling nearly 126,000,000 mi (203,000,000 km) – more than 525 times the distance from the Earth to the Moon. .