Portal:Physics/Anniversaries/April

• 1 April 1997 – Comet Hale-Bopp at perihelion
• 12 April 1633 – Galileo Galilei's trial starts
• 15 April 1707 – Leonhard Euler's birthday
• 18 April 1955 – Albert Einstein's death
• 22 April 1904 – J. Robert Oppenheimer's birthday
• 23 April 1858 – Max Planck's birthday
• 24 April 1990 – Hubble Space Telescope launched
• 25 April 1990 – Hubble Space Telescope deployed from the shuttle Discovery
• 30 April 1777 – Carl Friedrich Gauss's birthday