Heinrich Wilhelm Matthias Olbers
German astronomer who discovered asteroids and formulated Olbers's paradox.
Heinrich Wilhelm Matthias Olbers was a German astronomer and physician. Born in Arbergen, now part of Bremen, he studied medicine at the University of Göttingen, where he also learned mathematics from Abraham Gotthelf Kästner. While still a student in 1779, Olbers developed a groundbreaking method for calculating the orbits of comets while caring for a sick classmate. This technique was the first satisfactory approach to the problem and became a standard in the field. After earning his degree in 1780, he worked as a physician in Bremen, but devoted his nights to astronomy, converting the upper floor of his home into an observatory. In 1800, he was invited to join the "celestial police," a group of 24 astronomers searching for new planets. On 28 March 1802, he discovered the asteroid Pallas, and on 29 March 1807, he discovered Vesta, allowing Carl Friedrich Gauss to name the latter. At the time, these objects were considered planets, as the term "asteroid" had not yet been coined. Olbers proposed that the asteroid belt was the remnant of a destroyed planet, though modern science attributes its formation to Jupiter’s tidal effects. On 6 March 1815, he discovered a periodic comet now designated 13P/Olbers. In 1823, he described the paradox that the night sky’s darkness contradicts the idea of an infinite, eternal static universe, later known as Olbers’s paradox. He also recognized the talent of young Friedrich Wilhelm Bessel, arranging the publication of Bessel’s work on Halley’s Comet. Olbers was elected a Fellow of the Royal Society in 1804 and received other international honors. He served as a deputy at the baptism of Napoleon II in 1811 and was a member of the corps législatif in Paris from 1812 to 1813. He died in Bremen at age 81, survived by a son from his two marriages.
- field
- Astronomy
- nationality
- German
- known_for
- Discovery of asteroids Pallas and Vesta; method for calculating cometary orbits; Olbers's paradox
Lore & Background
Heinrich Wilhelm Matthias Olbers was a German astronomer and physician. He studied medicine at Göttingen, where he also took mathematics lessons from Abraham Gotthelf Kästner. While still a student, he developed a groundbreaking method for calculating the orbits of comets, which became the first satisfactory approach to the problem. After graduating in 1780, he worked as a physician in Bremen, but devoted his nights to astronomy, converting the upper floor of his home into an observatory. In 1800, he was invited to join the "celestial police," a group of astronomers searching for new planets. He discovered the asteroids Pallas in 1802 and Vesta in 1807, which were then considered full planets. He theorized that the asteroid belt was the remains of a destroyed planet, a view now superseded by the understanding that Jupiter's tidal forces prevented planet formation there. In 1815, he discovered a periodic comet later named 13P/Olbers. He is also known for Olbers's paradox, which argues that the darkness of the night sky contradicts the idea of an infinite, eternal, static universe. He was elected a Fellow of the Royal Society in 1804 and received other international honors. He died in Bremen at age 81, was twice married, and was survived by one son.
Reader's Guide
Heinrich Wilhelm Matthias Olbers, a German astronomer by avocation, made lasting contributions to astronomy through both observational discoveries and theoretical insights. Trained as a physician, he devised a novel method for calculating cometary orbits while still a student, a technique that became foundational in the field. He was among a group of astronomers tasked with finding new planets, and his efforts led to the discovery of two asteroids, Pallas and Vesta, in the early 1800s. Olbers proposed that the region containing these objects was the remnant of a destroyed planet, a view later superseded by the understanding that Jupiter’s tidal forces disrupted planet formation there. He also discovered a periodic comet that bears his name. His most famous theoretical contribution, Olbers’s paradox, argued that the darkness of the night sky contradicts the idea of an infinite, static, and eternal universe, influencing later thinking about the structure and age of the cosmos. Olbers recognized the exceptional quality of Friedrich Wilhelm Bessel’s early work on comet orbits and facilitated its publication, thereby advancing celestial mechanics. He was elected to several prominent scientific societies and served in political roles, including as a deputy at the baptism of Napoleon II and as a member of the corps legislatif. A statue in Bremen commemorates him.
Frequently Asked Questions
What asteroids did Olbers discover?
Olbers identified both Pallas and Vesta, two of the largest rocky bodies in the asteroid belt between Mars and Jupiter. His observations of these objects helped confirm that an entire population of small bodies occupied that region of the solar system.
What is Olbers's paradox?
It is the puzzle of why the night sky is dark if the universe is truly infinite and uniformly filled with stars, since every line of sight should eventually land on a stellar surface. Olbers raised this question in the early 1800s, and its eventual resolution pointed toward the finite age and expansion of the cosmos.
How did Olbers improve the calculation of cometary orbits?
He devised a streamlined mathematical procedure that let astronomers determine a comet's orbital elements from just a handful of observations. The method became a widely used practical tool for tracking newly discovered comets throughout the nineteenth century.
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