Where Are the Most Distant Cepheids Ever Observed?

💡 The Answer

• The Hubble Space Telescope has detected Cepheids in galaxies over 100 million light-years away.
• These observations are crucial for calibrating supernova distances.
• The Cepheids are near the limit of resolution; only the brightest pulsators are visible.
• They provide direct geometric distances to galaxies in the local universe.