Looked steadily
Else clues• Eyeballed
• Feasted one's eyes
• Goggled
• Looked (at)
• Looked (upon)
• Looked a long time
• Looked intently
• Looked longingly
• Peered
• Peered, as at a crystal ball
• Rubbernecked
• Stared at stars
• Stared blankly
• Stared out the window
• Studied, as the stars
• Took a long look
• Took in visually
• Used a telescope
• Used binoculars, perhaps