Thee In Thy Cosmic Form. The space and the arters This denotes that the Lord has filled the whole universe of animate and inanimate objects. In order to remove the doubt entertained by Arjuna as to his success (Cf.
Translation
11.20 You alone have pervaded the interspace between heaven and earth, and all the arters. Beholding Your marvellous and terrible form, O Mahatman, the three worlds are greatly overwhelmed with fear.
Meaning
Thee In Thy Cosmic Form. The space and the arters This denotes that the Lord has filled the whole universe of animate and inanimate objects. In order to remove the doubt entertained by Arjuna as to his success (Cf. II.6) Lord Krishna makes him feel now that victoyr for the Pandavas is certain.
Word by word
द्यावापृथिव्योः of heaven and earth इदम् this अन्तरम् interspace हि indeed व्याप्तम् is filled त्वया by Thee एकेन alone दिशः arters च and सर्वाः all दृष्ट्वा having seen अद्भुतम् wonderful रूपम् form उग्रम् terrible तव Thy इदम् this लोकत्रयम् the three worlds प्रव्यथितम् are trembling with fear महात्मन् O greatsouled Being.