What Is Parallax? How Astronomers Measure Stellar Distances!

Parallax is the apparent shift in position of a nearby object when viewed from different vantage points — just like your thumb jumping when you switch eyes! 🌟

In astronomy, scientists use Earth's orbit (a 2‑AU baseline) to measure tiny angles in nearby stars and calculate their distance via trigonometry.

🔍 **In this video you'll learn:**
• What parallax is — everyday and cosmic examples
• How Earth's orbit provides the measurement baseline of ~300 million km
• The first stellar parallax by Friedrich Bessel in 1838 and why it's so important
• How modern missions like ESA’s Hipparcos and Gaia expanded parallax reach—from hundreds to over a billion stars!

🧭 Why it matters: Parallax is the first rung of the cosmic distance ladder, anchoring all other distance measurements in astronomy.

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