…The spiritual world, the abode of the Supreme Personality of Godhead, Kṛṣṇa-which is known as Kṛṣṇaloka, Goloka Vṛndāvana-is described here. In the spiritual sky there is no need of sunshine, moonshine, fire or electricity, because all the planets are self-luminous. We have only one planet in this universe, the sun, which is self-luminous, but all the planets in the spiritual sky are self-luminous. The shining effulgence of all those planets (called Vaikuṇṭhas) constitutes the shining sky known as the brahmajyoti. Actually, the effulgence is emanating from the planet of Kṛṣṇa, Goloka Vṛndāvana. Part of that shining effulgence is covered by the mahat-tattva, the material world. Other than this, the major portion of that shining sky is full of spiritual planets, which are called Vaikuṇṭhas, chief of which is Goloka Vṛndāvana.
The abode of Lord Śrī Kṛṣṇa is described in the Bhagavad-gītā, Fifteenth Chapter, sixth verse:
na tad bhāsayate sūryo na śaśāṅko na pāvakaḥ
yad gatvā na nivartante tad dhāma paramaṁ mama
“That abode of Mine is not illumined by the sun or moon, nor by electricity. And anyone who reaches it never comes back to this material world.” (Bg. 15.6)
This verse gives a description of that eternal sky. Of course we have a material conception of the sky, and we think of it in relationship to the sun, moon, stars and so on, but in this verse the Lord states that in the eternal sky there is no need for the sun nor for the moon nor fire of any kind because the spiritual sky is already illuminated by the brahmajyoti, the rays emanating from the Supreme Lord. We are trying with difficulty to reach other planets, but it is not difficult to understand the abode of the Supreme Lord. This abode is referred to as Goloka. In the Brahma-saṁhitā it is beautifully described: Goloka eva nivasaty akhilātma-bhūtaḥ. The Lord resides eternally in His abode Goloka, yet He can be approached from this world, and to this end the Lord comes to manifest His real form, sac-cid-ānanda-vigraha. When He manifests this form, there is no need for our imagining what He looks like. To discourage such imaginative speculation, He descends and exhibits Himself as He is, as Śyāmasundara. Unfortunately, the less intelligent deride Him because He comes as one of us and plays with us as a human being. But because of this we should not consider that the Lord is one of us. It is by His potency that He presents Himself in His real form before us and displays His pastimes, which are prototypes of those pastimes found in His abode.
The Hare Krishna Movement 