사진첩/스크랩 썸네일형 리스트형 2004.11.18 Comet Hale-Bopp Over Indian Cove Credit & Copyright: Wally Pacholka (Astropics) Wally Pacholka Astronomy Picture of the Day Comet Hale-Bopp, the Great Comet of 1997, was quite a sight. 더보기 2004.11.18 Stellar Spectral Types: OBAFGKM Explanation: Astronomers divide stars into different spectral types. First started in the 1800s, the spectral type was originally meant to classify the strength of hydrogen absorption lines. A few types that best describe the temperature of the star remain in use today. The seven main spectral types OBAFGKM are shown above with the spectrum of a single "O" star at the top followed by two spectra.. 더보기 2004.11.18 Mercury and Venus in the West 2004.11.18 예쁘다. From: Astronomy Picture of the Day http://antwrp.gsfc.nasa.gov/apod/ap040402.html 더보기 2004.10.21 Satie gymnopedie 더보기 이전 1 다음
