［Alpha, Beta, Gamma アルファ、ベータ、ガンマ］ Stephen Smith January 14, 2019picture of the day The gamma-ray sky constructed from 6.5 years of 1–6.5 GeV data from the Fermi-LAT telescope. Colors indicate the strength of the gamma-ray emi…

［Alpha Orionis アルファオリオニス］ Stephen Smith December 19, 2018picture of the day Some stellar size comparisons. いくつかの恒星のサイズ比較。Note: The Picture of the Day will be on hiatus until December 26, 2018. In the interim, pleas…

［After the Dust Settles ほこりが落ち着いた後］ Stephen Smith February 4, 2020Picture of the Day Artist’s conception of a dust belt around a bright star. アーティストの明るい恒星の周りのダストベルトの概念。 Credit: NASA’s Spitzer Space Tel…