宇宙距离阶梯计算器
使用此宇宙距离阶梯计算器快速获得准确的计算结果。
Light-Years
3,261.56 ly
Light-Years vs Distance
公式
## The Cosmic Distance Ladder Astronomers use overlapping methods to measure distances at different scales: 1. **Radar ranging** (within solar system, < 10 AU) 2. **Stellar parallax** (< 1 000 pc with ground; < 10 000 pc with Gaia) 3. **Spectroscopic parallax / main-sequence fitting** (up to ~10 kpc) 4. **Cepheid variables** (up to ~30 Mpc) 5. **Type Ia supernovae** (up to ~1 000 Mpc) 6. **Hubble's law / redshift** (beyond ~100 Mpc) Each rung calibrates the next, building confidence across the cosmos.
计算示例
A star cluster at 1000 pc.
- 01Light-years: 1000 × 3.262 = 3 262 ly
- 02Parallax: 1/1000 = 0.001 arcsec = 1 mas
- 03This is within Gaia's reach but beyond ground-based parallax.
- 04Best methods: space parallax, spectroscopic parallax.
常见问题
Why do we need multiple methods?
No single method works at all distances. Each has a range where it is most accurate. Overlapping ranges allow cross-calibration.
What is the farthest distance we can measure?
Type Ia supernovae and baryon acoustic oscillations extend to billions of parsecs. Beyond that, the CMB at z ≈ 1100 is the last surface we can observe.
What is the biggest source of error?
Interstellar dust extinction and uncertain calibrations at each rung. The Hubble tension highlights remaining uncertainties.