Shafaqna Science: New high-contrast images from SPHERE show a stunning variety of debris disks shaped by collisions of tiny planet-building bodies. The structures often resemble our asteroid and Kuiper belts, hinting at unseen giant planets sculpting the dust.
Using the SPHERE instrument on ESO’s Very Large Telescope, astronomers have assembled an unprecedented set of images of debris disks in distant planetary systems. These are wide, dusty structures made of tiny particles that orbit other stars and trace the presence of unseen small bodies.
Gaël Chauvin (Max Planck Institute for Astronomy), project scientist for SPHERE and co-author of the study, explains: “This data set is an astronomical treasure. It provides exceptional insights into the properties of debris disks, and allows for deductions of smaller bodies like asteroids and comets in these systems, which are impossible to observe directly.”
Small Bodies in Our Own Solar System
To understand why this is so important, it helps to look at our own cosmic neighborhood. Beyond the Sun, the planets, and dwarf planets such as Pluto, our solar system is crowded with smaller (“minor”) bodies. Among these, astronomers are especially interested in objects that span from about a kilometer to several hundred kilometers in size. When such an object occasionally sheds gas and dust and develops a visible tail, we describe it as a comet. When it does not, we call it an asteroid.
These small bodies are time capsules. They preserve clues to the early stages of the solar system’s history, when tiny dust grains gradually grew into larger and larger objects. In this growth process, bodies known as planetesimals represent an intermediate step between dust and full-fledged planets. Asteroids and comets are leftover planetesimals that never grew into larger planets. In that sense, small bodies are (somewhat) modified remnants of the raw material that once built worlds like Earth.
New high-contrast images from SPHERE show a stunning variety of debris disks shaped by collisions of tiny planet-building bodies. The structures often resemble our asteroid and Kuiper belts, hinting at unseen giant planets sculpting the dust.
Using the SPHERE instrument on ESO’s Very Large Telescope, astronomers have assembled an unprecedented set of images of debris disks in distant planetary systems. These are wide, dusty structures made of tiny particles that orbit other stars and trace the presence of unseen small bodies.
Gaël Chauvin (Max Planck Institute for Astronomy), project scientist for SPHERE and co-author of the study, explains: “This data set is an astronomical treasure. It provides exceptional insights into the properties of debris disks, and allows for deductions of smaller bodies like asteroids and comets in these systems, which are impossible to observe directly.”
Small Bodies in Our Own Solar System
To understand why this is so important, it helps to look at our own cosmic neighborhood. Beyond the Sun, the planets, and dwarf planets such as Pluto, our solar system is crowded with smaller (“minor”) bodies. Among these, astronomers are especially interested in objects that span from about a kilometer to several hundred kilometers in size. When such an object occasionally sheds gas and dust and develops a visible tail, we describe it as a comet. When it does not, we call it an asteroid.
These small bodies are time capsules. They preserve clues to the early stages of the solar system’s history, when tiny dust grains gradually grew into larger and larger objects. In this growth process, bodies known as planetesimals represent an intermediate step between dust and full-fledged planets. Asteroids and comets are leftover planetesimals that never grew into larger planets. In that sense, small bodies are (somewhat) modified remnants of the raw material that once built worlds like Earth.