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आकाशगङ्गा

चित्र
आकाशगङ्गा एक तारापुञ्ज हो जहाँ हाम्रो सौर्यमण्डल (पृथ्वी समेत) रहेको छ। यो एक सङ्खाकार (स्पाइरल) तारापुञ्ज हो। यसको मुख्य चक्काको व्यास करिव ८०,००० देखि १ लाख प्रकाशवर्ष छ भने परिधि २,५०,००० देखि ३,००,००० प्रकाशवर्ष छ। ब्रम्हाण्ड मा अबलोकन गर्न सकिने अरबौं तारापुञ्जहरू मध्येको एक हो आकाशगङ्गा। (Coma Berenicesतारापुञ्जमा रहेको NGC 4414 नामको चक्राकार आकाशगंगा, यसको व्यास करिब ५५,००० प्रकाशवर्षरहेको अनुमान गरिएको यो तारापुञ्ज करिब ६०,००,००,००० प्रकाशवर्ष टाढा रहेको छ|) इतिहास= आकाशगङ्गाको आयु ठम्याउन निक्कै कठिन छ, तापनि यस पुञ्जको सबै भन्दा पुरानो ताराको आयु अन्दाजि करिव १३.६ अर्ब वर्ष छ जुन लगभग यस तारापुञ्जकै आयु समान छ। तारापुञ्ज गर्भ Main article: तारापुञ्ज गर्भ धनुराशि तिरको पुञ्जगर्भ। धनु (राशि)का मुख्य ताराहरू रातो देखाईएका छन तारापुञ्जिय चक्का, जुन गर्भबाट बाहिरतिर उठेको छ, को व्यास करिब ७० हजार देखि एक लाख प्रकाशवर्ष लामो छ।  सूर्य देखि पुञ्जगर्भ सम्मेको दुरी करिव २६,००० ± १४०० प्रकाशवर्ष लामो रहेको अनुमान छ। तारापुञ्जको गर्भमा ध...
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GRAIL Mission Returns First Video of Moon's Far Side

Maria Zuber: I'm Maria Zuber, Principal Investigator of NASA's GRAIL mission. GRAIL is the first planetary robotic mission that includes an imaging experiment that's devoted entirely to education and outreach, called the MoonKAM system. This video clip was made by Ebb as it flew above the surface of the moon that we don't see from Earth, from the north pole towards the south pole. The far side of the moon is extremely rugged. The surface also contains many impact craters, which are preserved features from asteroids that hit the moon's surface after it formed. The MoonKAM investigation will begin in March, when middle school students will have the opportunity to target interesting areas of the moon that they want to study. So stay tuned! ( मारिया Zuber : मैं मारिया Zuber , नासा कंघी बनानेवाले की रेती मिशन के प्रधान अन्वेषक हूँ . कंघी बनानेवाले की रेती पहले ग्रहों रोबोट मिशन है कि एक इमेजिंग प्रयोग है कि पूरी तरह से शिक्षा और...
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Seeing Red

चित्र
  This NASA Hubble Space Telescope infrared mosaic image represents the sharpest survey of the Galactic Center to date. It reveals a new population of massive stars and new details in complex structures in the hot ionized gas swirling around the central 300 x 115 light-years. This sweeping infrared panorama offers a nearby laboratory for how massive stars form and influence their environment in the often violent nuclear regions of other galaxies. The infrared mosaic was taken with Hubble's Near Infrared Camera and Multi-Object Spectrometer (NICMOS). The Galactic core is obscured in visible light by dust clouds, which infrared light can penetrate. The new NICMOS data show the glow from ionized hydrogen gas as well as a multitude of stars. NICMOS shows a large number of these massive stars distributed throughout the region. A new finding is that astronomers now see that the massive stars are not confined to one of the three known clusters of massive stars in the Ga...
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