📷 J. E. Bruce.
📷 J. E. Bruce.
www.youtube.com/watch?v=_r2H...
www.youtube.com/watch?v=_r2H...
inspirehep.net/jobs/3064718
inspirehep.net/jobs/3064718
💛🧡🍂🍁
💛🧡🍂🍁
In the early morning hours #OTD in 1923, Edwin Hubble took a photo plate of M31 that showed a Cepheid variable star.
Using Henrietta Swan Leavitt’s distance-luminosity relationship, Hubble concluded that M31 is another galaxy outside the Milky Way. 🧪 🔭 ⚛️
Image: Carnegie Observatories
In the early morning hours #OTD in 1923, Edwin Hubble took a photo plate of M31 that showed a Cepheid variable star.
Using Henrietta Swan Leavitt’s distance-luminosity relationship, Hubble concluded that M31 is another galaxy outside the Milky Way. 🧪 🔭 ⚛️
Image: Carnegie Observatories
An ancient astronomical calendar and the world’s oldest known analogue computer.
National Archaeological Museum, Athens, Greece.
An ancient astronomical calendar and the world’s oldest known analogue computer.
National Archaeological Museum, Athens, Greece.
Athens, Greece.
Athens, Greece.