하늘 다이제스트 PDF 내보내기
선택한 천체의 파인더 차트 포함:
오늘 밤 한눈에
행성 하이라이트
쌍안경 대상
소형 망원경 (3-6인치)
대형 망원경 (8-12인치)
이번 주
| 금 | 토 | 일 | 월 | 화 | 수 | 목 |
| 🌒 4% | 🌒 10% | 🌒 18% | 🌓 28% | 🌓 39% | 🌔 51% | 🌔 62% |
| — | — | — | — | — | — | — |
| Moon occults 17 Tau | Moon occults Beta Tau |
Collimate your reflector
A well-collimated telescope shows sharper stars and more detail. Use our interactive Collimation Guide to learn how.
Collimation GuideNASA 오늘의 천문학 사진
Launch Plume: SpaceX Jellyfish
ven if you live with your head in the clouds, you won’t find a jellyfish like this one very often. The featured image shows a SpaceX Falcon 9 rocket launch from Cape Canaveral in Florida on March 4. The launch happened 52 minutes before sunrise, and the second stage rocket exhaust plume was high enough in the sky to catch the light of the rising sun, while the photographer was still in the dark. This combination of light and shadow, possible at dawn or dusk, makes the exhaust, mostly water vapor and carbon dioxide, appear as a glowing cloud. It only looks like it's going down, as the rocket follows the curvature of the Earth on its way to space. A related effect is the twilight phenomenon, which causes colorful contrails sometimes mistaken for UFOs. But, in case you are wondering: real jellyfish were sent to space by NASA in the 1990s as part of a science experiment.
이미지 출처: Michael Seeley — APOD는 NASA의 서비스입니다 Michigan Tech. U.
NASA APOD에서 보기