Anders Jonas Ångström
A Swedish physicist who mapped the universe's hidden colors, giving science the fundamental unit to measure light itself.
1814–1874 (age 60)·Swedish physicist·Birthday: August 13
Biography
Anders Jonas Ångström was a quiet pioneer who found a universe of information in the narrow bands of light. Working at Uppsala University in the mid-19th century, he turned his precise mind to the new science of spectroscopy—the study of light broken into its constituent colors. His masterwork was a meticulous map of the solar spectrum, identifying the dark lines (Fraunhofer lines) and correctly hypothesizing they were caused by elements in the sun's atmosphere. His relentless pursuit of accuracy led him to measure light wavelengths in units of one ten-millionth of a millimeter, a scale so useful it was later named the angstrom in his honor. While he studied heat and magnetism, his legacy is written in light; he provided the foundational grammar for astrophysicists to later decipher the chemical composition of stars, planets, and nebulae.
#1 When Anders Was Born
The biggest hits of 1814
Anders's Life & Times
The world at every milestone
1814Born
1819Started school
1827Became a teenager
1830Could drive
1832Could vote
1835Turned 21
1844Turned 30
1854Turned 40
1864Turned 50
President: Abraham Lincoln
1874Turned 60
President: Ulysses S. Grant
Key Achievements
- Pioneered the field of spectroscopy with his 1868 detailed mapping of the solar spectrum.
- Correctly proposed that the dark lines in the solar spectrum indicated the presence of specific chemical elements in the sun's atmosphere.
- His work laid the essential groundwork for the science of astrophysics.
- The angstrom unit (Å), equal to 10^-10 meters, is named for him and remains a standard unit in atomic-scale physics and chemistry.
Did You Know?
He was one of the first scientists to examine the spectrum of the aurora borealis.
His son, Knut Ångström, also became a noted physicist who researched solar radiation and terrestrial magnetism.
The angstrom unit is so commonly used that it has a dedicated symbol (Å) on computer keyboards and in typography.
“Light reveals the composition of the sun and stars through its distinct spectral lines.”
