AN3.80:4.1: “Yāvatā, ānanda, candimasūriyā pariharanti, disā bhanti virocanā, tāva sahassadhā loko.
AN3.80:4.1: “Ānanda, a galaxy extends a thousand times as far as the moon and sun revolve and the shining ones light up the quarters.
AN3.80:4.2: Tasmiṃ sahassadhā loke sahassaṃ candānaṃ, sahassaṃ sūriyānaṃ, sahassaṃ sinerupabbatarājānaṃ, sahassaṃ jambudīpānaṃ, sahassaṃ aparagoyānānaṃ, sahassaṃ uttarakurūnaṃ, sahassaṃ pubbavidehānaṃ, cattāri mahāsamuddasahassāni, cattāri mahārājasahassāni, sahassaṃ cātumahārājikānaṃ, sahassaṃ tāvatiṃsānaṃ, sahassaṃ yāmānaṃ, sahassaṃ tusitānaṃ, sahassaṃ nimmānaratīnaṃ, sahassaṃ paranimmitavasavattīnaṃ, sahassaṃ brahmalokānaṃ—
AN3.80:4.2: In that galaxy there are a thousand moons, a thousand suns, a thousand Sinerus king of mountains, a thousand Indias, a thousand Western Continents, a thousand Northern Continents, a thousand Eastern Continents, four thousand oceans, four thousand Great Kings, a thousand realms of the Gods of the Four Great Kings, a thousand realms of the Gods of the Thirty-Three, of the Gods of Yama, of the Joyful Gods, of the Gods who Love to Create, of the Gods who Control the Creations of Others, and a thousand Brahmā realms.
AN3.80:4.3: ayaṃ vuccatānanda, sahassī cūḷanikā lokadhātu.
AN3.80:4.3: This is called a thousandfold lesser world system, a ‘galaxy’.
A sahassī cūḷanikā lokadhātu, a “thousandfold lesser world system” is called a “galaxy” by Bhante Sujato.
AN3.80:5.1: Yāvatānanda, sahassī cūḷanikā lokadhātu tāva sahassadhā loko.
AN3.80:5.1: A world system that extends for a thousand galaxies
AN3.80:5.2: Ayaṃ vuccatānanda, dvisahassī majjhimikā lokadhātu.
AN3.80:5.2: is called a millionfold middling world system, a ‘galactic cluster’.
A dvisahassī majjhimikā lokadhātu, a “millionfold middling world system”, is called a “galactic cluster”.
AN3.80:6.1: Yāvatānanda, dvisahassī majjhimikā lokadhātu tāva sahassadhā loko.
AN3.80:6.1: A world system that extends for a thousand galactic clusters
AN3.80:6.2: Ayaṃ vuccatānanda, tisahassī mahāsahassī lokadhātu.
AN3.80:6.2: is called a billionfold great world system, a ‘galactic supercluster’.
A tisahassī mahāsahassī lokadhātu, a “billionfold great world system”, is called a “galactic supercluster”.
As I understand it, Bhante is adding the modern descriptions that capture in our terms about the same as what has been expressed in the Pali.