09/30/2021
Electron revolve around the nucleus with velocity of about 2.19×10^6 m/s
09/23/2021
you went to space, you’d take a selfie, too. NASA, who provides the image, writes:
“On June 3, 1965 Edward H. White II became the first American to step outside his spacecraft and let go, effectively setting himself adrift in the zero gravity of space. For 23 minutes White floated and maneuvered himself around the Gemini spacecraft while logging 6500 miles during his orbital stroll. White was attached to the spacecraft by a 25 foot umbilical line and a 23-ft. tether line, both wrapped in gold tape to form one cord. In his right hand White carries a Hand Held Self Maneuvering Unit (HHSMU) which is used to move about the weightless environment of space. The visor of his helmet is gold plated to protect him from the unfiltered rays of the sun.
09/21/2021
In its 19 years of operation, the Hubble Space Telescope has revealed the universe to us in all its beauty and mystery. Among thousands of images, these are some of the most memorable
09/14/2021
This discovery space shuttle picture above Switzerland is stunning