All Astronomy Calculators Related Post

Lithium Abundance Calculator Calculate Lithium Abundance Stellar Age (Gyr): Metallicity [Fe/H]: Stellar Mass (Solar Masses): Environment: Disk StarHalo StarBulge Star Calculate About the Lithium Abundance Calculator The Lithium Abundance Calculator is a scientifically rigorous tool designed to estimate the surface lithium abundance in stars based on stellar age, metallicity, mass, and galactic environment. This calculator […]

Deuterium Abundance Calculator Sample Name (Optional) Measured D/H Ratio (in ppm) Enter the deuterium-to-hydrogen ratio in parts per million (ppm) Reference Standard VSMOW (Standard: 155.76 ppm)VSLAP (Standard: 428.5 ppm)Custom Standard Custom Standard D/H (ppm) Output Unit δD (‰ vs VSMOW)D/H Ratio (ppm)Atom % Deuterium Calculate Deuterium Abundance Results About the Deuterium Abundance Calculator The Deuterium

Helium Fraction Calculator Calculate Helium Mass Fraction (Y) Calculation Context: Big Bang Nucleosynthesis (BBN)Stellar Evolution ModelObserved Galaxy/Astronomical Object Baryon-to-Photon Ratio (η × 10¹⁰): Initial Helium Fraction (Y₀): Metallicity Enrichment Factor (ΔY/ΔZ): Current Metallicity (Z): Hydrogen Mass Fraction (X): Metallicity Mass Fraction (Z): Calculate Helium Fraction Results About the Helium Fraction Calculator The Helium Fraction Calculator

Primordial Abundance Calculator Baryon-to-Photon Ratio (η × 10¹⁰) Standard value: ~6.1 (from CMB observations) Neutron Lifetime (seconds) Latest PDG value: 879.4 ± 0.6 s Hubble Parameter Adjustment (h) Planck 2018: h = 0.674 Include Deuterium Bottleneck Yes (Standard BBN)No (Simplified) Calculate Primordial Abundances Primordial Abundance Results About the Primordial Abundance Calculator The Primordial Abundance Calculator

Big Bang Nucleosynthesis Calculator Baryon Density (Ωbh²) Neutron Lifetime (τn, seconds) Freeze-out Temperature (T, MeV) Output Format Mass Fractions (X)Abundance Ratios (Y/He) Calculate BBN Abundances BBN Results About the Big Bang Nucleosynthesis Calculator The Big Bang Nucleosynthesis Calculator is a precision scientific tool that predicts the primordial abundances of light elements formed in the first

Neutrino Decoupling Calculator CMB Temperature Today, T₀ (mK) Default: 2.725 mK (Planck 2018) Effective Neutrino Species, Neff Standard Model: 3.046 (includes QED corrections) Entropy Conservation Model Standard (e⁺e⁻ annihilation only)Finite Temperature QED CorrectionsCustom g₀ (advanced) Initial g₀ (before e⁺e⁻ annihilation) Default: 2 (γ) + 8×(7/8) (e⁺e⁻) = 10.75 Calculate Decoupling Results About the Neutrino Decoupling

Photon Decoupling Calculator Redshift (z) Hubble Constant H₀ (km/s/Mpc) Matter Density Ωₘ Baryon Density Ω₆ CMB Temperature Today T₀ (K) Calculate Decoupling Decoupling Results About the Photon Decoupling Calculator The Photon Decoupling Calculator is a precision cosmology tool that computes the exact moment when photons decoupled from baryonic matter in the early universe — the

Recombination Epoch Calculator Redshift (z) at Recombination Typical range: 1000–1200 (Planck 2018: z ≈ 1090) Hubble Constant H₀ (km/s/Mpc) Planck 2018: 67.4 ± 0.5 km/s/Mpc Matter Density Parameter (Ωₘ) Planck 2018: Ωₘ ≈ 0.315 Baryon Density Parameter (Ω₆) Planck 2018: Ω₆h² ≈ 0.0224 → Ω₆ ≈ 0.049 Calculate Recombination Epoch Recombination Epoch Results About the

Dark Age Calculator Start Year of Decline (e.g., 476 AD) End Year of Recovery (e.g., 800 AD) Historical Region Western EuropeByzantine EmpireIslamic Golden Age (Counter)China (Tang Dynasty)India (Gupta Decline)Custom Region Annual Cultural Decline Rate (%) Annual Recovery Rate (%) Calculate Dark Age Index Dark Age Analysis About the Dark Age Calculator The Dark Age Calculator

Galaxy Formation Time Calculator Redshift (z) Enter the observed redshift of the galaxy (z > 0). Cosmological Model Planck 2018 (ΛCDM)WMAP9Early Universe (z>10) Hubble Constant H₀ (km/s/Mpc) Matter Density Ωₘ Calculate Formation Time Galaxy Formation Results About the Galaxy Formation Time Calculator The Galaxy Formation Time Calculator is a precision cosmology tool that determines when