The Large Ultraviolet Optical Infrared Surveyor, commonly known as LUVOIR (), is a multi-wavelength space telescope concept being developed by NASA under the leadership of a Science and Technology Definition Team. It is one of four large astrophysics space mission concepts studied in preparation for the

National Academy of Sciences The National Academy of Sciences (NAS) is a United States nonprofit, non-governmental organization. NAS is part of the National Academies of Sciences, Engineering, and Medicine, along with the National Academy of Engineering (NAE) and the Nati ...

2020 Astronomy and Astrophysics Decadal Survey. While LUVOIR is a concept for a general-purpose observatory, it has the key science goal of characterizing a wide range of

exoplanet An exoplanet or extrasolar planet is a planet outside the Solar System. The first possible evidence of an exoplanet was noted in 1917 but was not recognized as such. The first confirmation of detection occurred in 1992. A different planet, init ...

s, including those that might be

habitable Habitability refers to the adequacy of an environment for human living. Where housing is concerned, there are generally local ordinances which define habitability. If a residence complies with those laws it is said to be habitable. In extreme e ...

. An additional goal is to enable a broad range of

astrophysics Astrophysics is a science that employs the methods and principles of physics and chemistry in the study of astronomical objects and phenomena. As one of the founders of the discipline said, Astrophysics "seeks to ascertain the nature of the h ...

, from the reionization epoch, through galaxy formation and evolution, to

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

and planet formation. Powerful imaging and

spectroscopy Spectroscopy is the field of study that measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter as a function of the wavelength or frequency of the radiation. Matter wa ...

observations of Solar System bodies would also be possible. LUVOIR would be a

Large Strategic Science Mission NASA's large strategic science missions or large strategic missions, formerly known as Flagship missions or Flagship-class missions, are the costliest and most capable NASA science spacecraft. Flagship missions exist within all four divisions ...

and was considered for a development start sometime in the 2020s. The LUVOIR Study Team, under Study Scientist Aki Roberge, has produced designs for two variants of LUVOIR: one with a 15.1 m diameter telescope mirror (LUVOIR-A) and one with an 8 m diameter mirror (LUVOIR-B). LUVOIR would be able to observe ultraviolet,

visible Visibility, in meteorology, is a measure of the distance at which an object or light can be seen. Visibility may also refer to: * A measure of turbidity in water quality control * Interferometric visibility, which quantifies interference contrast ...

, and near-infrared wavelengths of light. The Final Report on the 5-year LUVOIR mission concept study was publicly released on 26 August 2019. On 4 November 2021, the 2020 Astrophysics Decadal Survey recommended development of a "large (~6 m aperture) infrared/optical/ultraviolet (IR/O/UV) space telescope", with the science goals of searching for signatures of life on planets outside of the solar system and enabling a wide range of transformative astrophysics. Such a mission draws upon both the LUVOIR and

HabEx The Habitable Exoplanet Observatory (HabEx) is a space telescope concept that would be optimized to search for and image Earth-size habitable exoplanets in the habitable zones of their stars, where liquid water can exist. HabEx would aim to u ...

mission concepts.

Background

In 2016, NASA began considering four different space telescope concepts for future Large Strategic Science Missions. They are the Habitable Exoplanet Imaging Mission (HabEx), Large Ultraviolet Optical Infrared Surveyor (LUVOIR), Lynx X-ray Observatory (lynx), and Origins Space Telescope (OST). In 2019, the four teams turned in their final reports to the

, whose independent Decadal survey committee advises NASA on which mission should take top priority. If funded, LUVOIR would launch in approximately 2039 using a heavy launch vehicle, and it would be placed in an orbit around the Sun–Earth Lagrange 2.

Mission

LUVOIR's main goals are to investigate

s, cosmic origins, and the Solar System. LUVOIR would be able to analyze the structure and composition of exoplanet atmospheres and surfaces. It could also detect

biosignature A biosignature (sometimes called chemical fossil or molecular fossil) is any substance – such as an element, isotope, or molecule – or phenomenon that provides scientific evidence of past or present life. Measurable attribute ...

s arising from life in the atmosphere of a distant exoplanet. Atmospheric biosignatures of interest include , CO, molecular oxygen (), ozone (), water (), and methane (). LUVOIR's multi-wavelength capability would also provide key information to help understand how a host star's UV radiation regulates the atmospheric photochemistry on habitable planets. LUVOIR will also observe large numbers of exoplanets spanning a wide range of characteristics (mass, host star type, age, etc.), with the goal of placing the Solar System in a broader context of planetary systems. Over its five-year primary mission, LUVOIR-A is expected to identify and study 54 potentially habitable exoplanets, while LUVOIR-B is expected to identify 28. The scope of astrophysics investigations include explorations of cosmic structure in the far reaches of space and time, formation and evolution of

galaxies A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...

, and the birth of

s and

planetary system A planetary system is a set of gravitationally In physics, gravity () is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is, by far, the weakest of the four fundamental interacti ...

s. In the area of Solar System studies, LUVOIR can provide up to about 25 km imaging resolution in visible light at Jupiter, permitting detailed monitoring of atmospheric dynamics in Jupiter,

Saturn Saturn is the sixth planet from the Sun and the second-largest in the Solar System, after Jupiter. It is a gas giant with an average radius of about nine and a half times that of Earth. It has only one-eighth the average density of Earth; h ...

, Uranus, and

Neptune Neptune is the eighth planet from the Sun and the farthest known planet in the Solar System. It is the fourth-largest planet in the Solar System by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times ...

over long timescales. Sensitive, high resolution imaging and spectroscopy of Solar System comets,

asteroid An asteroid is a minor planet of the inner Solar System. Sizes and shapes of asteroids vary significantly, ranging from 1-meter rocks to a dwarf planet almost 1000 km in diameter; they are rocky, metallic or icy bodies with no atmosphere. ...

s, moons, and Kuiper Belt objects that will not be visited by spacecraft in the foreseeable future can provide vital information on the processes that formed the Solar System ages ago. Furthermore, LUVOIR has an important role to play by studying plumes from the ocean moons of the outer Solar System, in particular

Europa Europa may refer to: Places * Europe * Europa (Roman province), a province within the Diocese of Thrace * Europa (Seville Metro), Seville, Spain; a station on the Seville Metro * Europa City, Paris, France; a planned development * Europa Cliff ...

and Enceladus, over long timescales.

Design

Comparison of LUVOIR-A and -B primary mirrors with Hubble and JWST

LUVOIR would be equipped with an internal coronagraph instrument, called ECLIPS for Extreme Coronagraph for LIving Planetary Systems, to enable direct observations of Earth-like exoplanets. An external

starshade The New Worlds Mission is a proposed project comprising a large occulter flying in formation with a space telescope designed to block the light of nearby stars in order to observe their orbiting exoplanets. The observations could be taken with a ...

is also an option for the smaller LUVOIR design (LUVOIR-B). Other candidate science instruments studied are: High-Definition Imager (HDI), a wide-field near-UV, optical, and near-infrared camera; LUMOS, a LUVOIR Ultraviolet Multi-Object

Spectrograph An optical spectrometer (spectrophotometer, spectrograph or spectroscope) is an instrument used to measure properties of light over a specific portion of the electromagnetic spectrum, typically used in spectroscopic analysis to identify mate ...

; and POLLUX, an ultraviolet

spectropolarimeter Polarimetry is the measurement and interpretation of the Polarization (waves), polarization of transverse waves, most notably electromagnetic waves, such as Radio wave, radio or light waves. Typically polarimetry is done on electromagnetic waves ...

. POLLUX (high-resolution UV

) is being studied by a European consortium, with leadership and support from the CNES, France. The observatory can observe wavelengths of light from the

far-ultraviolet Ultraviolet (UV) is a form of electromagnetic radiation with wavelength from 10 nanometer, nm (with a corresponding frequency around 30 Hertz, PHz) to 400 nm (750 Hertz, THz), shorter than that of visible light, but longer than ...

to the near-infrared. To enable the extreme wavefront stability needed for coronagraphic observations of Earth-like exoplanets, the LUVOIR design incorporates three principles. First, vibrations and mechanical disturbances throughout the observatory are minimized. Second, the telescope and coronagraph both incorporate several layers of wavefront control through active optics. Third, the telescope is actively heated to a precise to control thermal disturbances. The LUVOIR technology development plan is supported with funding from NASA's

Astrophysics Strategic Mission Concept Studies Astrophysics Strategic Mission Concept Studies MSCSis an program within the NASA, National Aeronautics and Space Administration agency of the United States government for possible projects leading to probable prospective missions. History Pr ...

program, the

Goddard Space Flight Center The Goddard Space Flight Center (GSFC) is a major NASA space research laboratory located approximately northeast of Washington, D.C. in Greenbelt, Maryland, United States. Established on May 1, 1959 as NASA's first space flight center, GSFC empl ...

, the

Marshall Space Flight Center The George C. Marshall Space Flight Center (MSFC), located in Redstone Arsenal, Alabama (Huntsville postal address), is the U.S. government's civilian rocketry and spacecraft propulsion research center. As the largest NASA center, MSFC's first ...

, the Jet Propulsion Laboratory and related programs at

Northrop Grumman Aerospace Systems Northrop Grumman Corporation is an American multinational aerospace and defense technology company. With 90,000 employees and an annual revenue in excess of $30 billion, it is one of the world's largest weapons manufacturers and military techno ...

and Ball Aerospace.

LUVOIR-A

LUVOIR-A, previously known as the High Definition Space Telescope (HDST), would be composed of 36 mirror segments with an aperture of in diameter, offering images up to 24 times sharper than the Hubble Space Telescope. LUVOIR-A would be large enough to find and study the dozens of Earthlike planets in our nearby neighborhood. It could resolve objects such as the nucleus of a small

galaxy A galaxy is a system of stars, stellar remnants, interstellar gas, dust, dark matter, bound together by gravity. The word is derived from the Greek ' (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. ...

or a gas cloud on the way to collapsing into a

and planets. The first study for the HDST was published by the Association of Universities for Research in Astronomy (AURA) on 6 July 2015. The case for HDST was made in a report entitled "From Cosmic Birth to Living Earths", on the future of astronomy commissioned by AURA, which runs the Hubble and other observatories on behalf of NASA and the National Science Foundation. Ideas for the original HDST proposal included an internal coronagraph, a disk that blocks light from the central star, making a dim planet more visible, and a

that would float kilometers out in front of it to perform the same function. LUVOIR-A folds so it only needs an 8-metre wide payload fairing. Initial cost estimates are approximately US$10 billion, with lifetime cost estimates of $18 billion to $24 billion.

LUVOIR-B

LUVOIR-B, previously known as the Advanced Technology Large-Aperture Space Telescope (ATLAST), is an 8-metre architecture initially developed by the Space Telescope Science Institute, the science operations center for the Hubble Space Telescope (HST) and the

James Webb Space Telescope The James Webb Space Telescope (JWST) is a space telescope which conducts infrared astronomy. As the largest optical telescope in space, its high resolution and sensitivity allow it to view objects too old, distant, or faint for the Hubble Spa ...

(JWST). While smaller than LUVOIR-A, it is being designed to produce an angular resolution that is 5–10 times better than the JWST, and a sensitivity limit that is up to 2,000 times better than HST. The LUVOIR Study Team expects that the telescope would be able to be serviced – similar to HST – either by an uncrewed spacecraft or by astronauts via Orion or

Starship A starship, starcraft, or interstellar spacecraft is a theoretical spacecraft designed for interstellar travel, traveling between planetary systems. The term is mostly found in science fiction. Reference to a "star-ship" appears as early as 188 ...

. Instruments such as cameras could potentially be replaced and returned to Earth for analysis of their components and future upgrades. The original backronym used for the initial mission concept, "ATLAST", was a pun referring to the time taken to decide on a successor for HST. ATLAST itself had three different proposed architectures – an monolithic mirror telescope, a segmented mirror telescope, and a segmented mirror telescope. The current LUVOIR-B architecture adopts JWST design heritage, essentially being an incrementally larger variant of the JWST, which has a 6.5 m segmented main mirror. Running on solar power, it would use an internal coronagraph or an external

occulter An occulting disk is a small disk used in a telescope to block the view of a bright object in order to allow observation of a fainter one. The coronagraph, at its simplest, is an occulting disk in the focal plane of a telescope, or in front of th ...

which can characterize the atmosphere and surface of an Earth-sized exoplanet in the habitable zone of long-lived stars at distances up to , including its rotation rate, climate, and habitability. The telescope would also allow researchers to glean information on the nature of the dominant surface features, changes in cloud cover and climate, and, potentially, seasonal variations in surface vegetation. LUVOIR-B was designed to launch on a heavy-lift rocket with an industry-standard diameter launch fairing. Lifetime cost estimates range from $12 billion to $18 billion.

References

External links

Large Ultraviolet Optical Infrared Telescope
project website
Large UV/Optical/IR Surveyor
at the

Advanced Technology Large-Aperture Space Telescope
at the Goddard Space Flight Center
Advanced Technology Large-Aperture Space Telescope
at STScI
High Definition Space Telescope
at

AURA Aura most commonly refers to: * Aura (paranormal), a field of luminous multicolored radiation around a person or object * Aura (symptom), a symptom experienced before a migraine or seizure Aura may also refer to: Places Extraterrestrial * 1488 ...

{{Exoplanet search projects Exoplanet search projects Proposed NASA space probes Proposed satellites Space telescopes Spacecraft using halo orbits Ultraviolet telescopes Artificial satellites at Earth-Sun Lagrange points