Each universe is covered by various layers of material elements (The 7 material gross and subtle layers of the outer Brahmanda covering), and therefore although the universes are clustered together, we cannot see from one universe to another.

Our Solar System does not fit the category of a ''universe'' according to Srimad Bhagavatam.

Srila Prabhupada - ''Each universe is covered by various layers of material elements (The 7 material gross and subtle layers of the outer Brahmanda covering), and therefore although the universes are clustered together, we cannot see from one universe to another. In other words, whatever we see is within this one universe. Srimad Bhagavatam Canto 5 Chapter 21 Text 11, Purport

Srila Prabhupada - ''We have to imagine that these universes (Brahmandas), which according to our limited knowledge are expanded unlimitedly, are so great that the gross and subtle ingredients—the five elements of the cosmic manifestation, namely earth, water, fire, air and sky, along with the total material energy and false ego—are not only within the universe but cover the universe in seven layers, each layer ten times bigger than the previous one'' Krishna Book 87

It IS impossible to see the millions of other Brahmandas outside our inner universe (inside a massive Brahmanda) because of being surrounded by 7 thick material layers that only rare mystic yogis and advanced devotees like Arjuna can see and pass through. Krishna and Arjuna did not encounter such limitations we experience.

Srila Prabhupada - ''The Lord is not visible to the eyes of ordinary men, those who are beyond the covering layers because of their transcendental devotional service can still see Him''. Krsna Book 87

Srila Prabhupada - ''Lord Krishna and Arjuna crossed over the great region of darkness covering the material universes. Arjuna then saw the effulgence of light known as the brahmajyoti. The brahmajyoti is situated ''outside the covering of the material universes'', and because it cannot be seen with our present eyes, this brahmajyoti is sometimes called avyakta''. Krsna Book, 89