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What excites astronomers and physicists alike is that the tools are now at hand to greatly expand current understanding of fundamental physics in new and important ways. Astronomy is a rich and diverse science that encompasses much more than the grand challenges described above. There are great opportunities to be seized over a broad research program, as described in Chapter 2. Astronomy is still driven by discovery, and when the programs described in past decadal surveys were successfully executed, many of the most important results were largely unanticipated.

In addition to carrying out the observational program described, they will advance the broad research program and are also able to both make and respond to fresh breakthroughs. The committee was charged to consider alternative budget scenarios. It chose to adopt for each agency the agency-projected budget and a second, optimistic budget that reflects modest relative growth. The optimistic budget used by the committee is flat in FY dollars. In the case of the National Science Foundation NSF , the agency-projected budget is flat in FY dollars, which allows little to no opportunity for new activity over the entire decade, given the obligations to support existing facilities.

The optimistic budget used by the committee supposes growth in purchasing power at a rate of 4 percent per year, the so-called doubling scenario that is being applied to the overall NSF budget. Reductions that would be needed under less favorable budgets are also described. A successful federal research program must also be balanced.

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There is a trade-off between investing in the development and construction of ambitious new. The goal of the committee, consistent with its charge, has been to maximize the science return for a given budget. The committee found that in some cases the balance of resources is not optimal, and this report contains a number of recommendations to augment or adjust the foundations of the program. These criteria are discussed further below.

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The resulting program emphasizes certain capabilities for U. Although a good-faith attempt has been made to provide answers to all the questions raised by the charge, it is in the very nature of research that unforeseen issues requiring community advice will arise. In addition, there will be a need to monitor progress.

Accordingly, implementation of the survey will require stewardship over the coming decade in the form of strategic advice requested by but generated independent of the agencies supporting the field. Such a decadal survey im plementation advisory committee DSIAC should be charged to produce annual reports to the agencies, the Office of Management and Budget, and the Office of Science and Technology Policy, as well as a mid-decade review of the progress made. The implementation advisory committee should be independent of the agencies and the agency advisory committees in its mem bership, management, and operation.

All values are in FY dollars.


It will employ three distinct techniques—measurements of weak gravitational lensing, supernova distances, and baryon acoustic oscillations—to determine the effect of dark energy on the evolution of the universe. An equally important outcome will be to open up a new frontier of exoplanet studies by monitoring a large sample of stars in the central bulge of the Milky Way for changes in brightness due to microlensing by intervening solar systems.

This census, combined with that made by the Kepler mission, will determine how common Earth-like planets are over a wide range of orbital parameters. It will also, in guest investigator mode, survey our galaxy and other nearby galaxies to answer key questions about their formation and structure, and the data it obtains will provide fundamental constraints on how galaxies grow. The telescope exploits the important work done. All costs are given in FY dollars. A recommendation of level funding is equivalent to a recommendation of constant level of effort.

Details on the methodology used to assess cost and schedule risk and technical readiness are provided in Chapter 7 and Appendix C. Cost and schedule risk was assessed relative to project estimates. Technical readiness was assessed independent of cost. The risk scale used was low, medium low, medium, medium high, and high.

WFIRST is based on mature technologies with technical risk that is medium low and has medium cost and schedule risk. The recommended schedule has a launch data of with a 5-year baseline mission. An extended year mission could improve the statistical results and further broaden the science program. WFIRST addresses fundamental and pressing scientific questions and will contribute to a broad range of astrophysics.

It is a part of coordinated and synergistic programs in fields in which the United States has pioneered the progress to date. It presents opportunities for interagency and perhaps international collaboration that would tap complementary experience and skills. It also presents relatively low technical and cost risk, making its completion feasible within the decade, even in a constrained budgetary environment.

The Explorer program supports small and medium-size missions, selected through competitive peer review, that are developed and launched on roughly 5-year timescales. Explorers have delivered a scientific return on investment at the highest level over the past two decades. Cosmic Background Explorer COBE discovered that the cosmic microwave background CMB has measurable fluctuations, demonstrated that these tiny variations imprint precise information about the early universe.

WMAP is credited with obtaining the best measurements of the age, geometry, and content of the universe. The Swift mission has transformed understanding of explosive gamma-ray burst events, and it holds the record for detecting the most distant object in the universe. LISA employs three separated spacecraft to detect long-wavelength ripples in the fabric of space-time, thereby opening a new window on the universe.

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LISA will detect the mergers of black holes with masses ranging from 10, to 10 million solar masses at cosmological distances, and will make a census of compact binary systems throughout the Milky Way. LISA promises new discoveries as well as progress on central questions such as understanding the growth of galaxies and black holes. LISA will also test general relativity with exquisite precision in regimes inaccessible on Earth. The cost and schedule risk classification is medium high.

If Pathfinder is not a success or if a roughly equal partnership is not possible, the committee recommends that NASA request advice from a decadal survey implementation advisory committee DSIAC to review the situation mid-decade. LISA presents a compelling scientific opportunity, and there is readiness to address its remaining technical challenges. Overall the recommendation and prioritization for LISA reflect its compelling science case and the relative level of technical readiness.

IXO is a versatile, large-area, high-spectral-resolution X-ray telescope that will make great advances on broad fronts ranging from characterization of black holes to elucidation of cosmology and the life cycles of matter and energy in the cosmos. Central to many of the science questions identified by this survey, IXO will revolutionize high-energy astrophysics with more than an-order-of-magnitude improvement in capabilities.

The technical risk is also medium high. Cost threats and uncertainties due to the immaturity of some of the required technologies have added considerably to the cost appraisal. The budget profiles used by the committee to define an overall program are unlikely to permit a start before the end of the decade—allowing time for the necessary technology maturation and risk reduction.

If the technology development program is not successful in bringing cost estimates below this level, descope options must be considered.


The ranking of IXO as the fourth-priority large space mission reflects the technical, cost, and programmatic uncertainties associated with the project at the current time. Many high-priority science questions require an X-ray. One of the fastest-growing and most exciting fields in astrophysics is the study of planets beyond our solar system. The ultimate goal is to image rocky planets that lie in the habitable zone—at a distance from their central star where water can exist in liquid form—and to characterize their atmospheres.

To prepare for this endeavor, the committee recommends a program to lay the technical and scientific foundations for a future space imaging and spectroscopy mission. NASA and NSF should support an aggressive program of ground-based high-precision radial velocity surveys of nearby stars to identify potential candidates. In the first part of the decade NASA should support competed technology development to advance multiple possible technologies for a next-decade planet imager, and should accelerate measurements of exozodiacal light levels that will determine the size and complexity of such missions.

If, by mid-decade, a DSIAC review determines that sufficient information has become or is becoming available on key issues such as planet frequency and exozodiacal dust distribution, a technology down-select should be made and the level of support increased to enable a mission capable of studying nearby Earth-like planets to be mature for consideration by the decadal survey, with a view to a start early in the decade. Detecting the distinctive imprint on the cosmic microwave background caused by gravitational waves produced during the first few moments of the universe would provide evidence for the theory of inflation and open a new window on exotic physics in the early universe.

Progress in detecting this signal is rapid, with advances from ground-based telescopes, suborbital flights, and the recently launched Planck satellite. If the polarization pattern imprinted by gravitational waves from the epoch of inflation is detected during this decade, the committee recommends a technology. The resulting proposal would be considered by the decadal survey. A competed U. They provide the long-term foundation for new ideas that stretch the imagination, and they lay the groundwork for far-future vision missions. They support the maturation of new technologies needed for nearer-term Explorer and flagship missions.

They provide the means to understand and interpret scientific results. Maintaining these core activities has a high priority for the survey committee, and the budget allocations should not be allowed to decrease to address overruns in the costs of large and medium missions. In addition, the following unranked specific augmentations are recommended. Astrophysics Theory Program. To prepare for a future major ultraviolet mission to succeed the Hubble Space Telescope, it will be necessary to carry out a mission-definition program.

Intermediate Technology Development. Formally this gap is associated with technology readiness. Laboratory Astrophysics. Care should be taken to ensure that these needs are met. Suborbital Program. The balloon and sounding rocket programs provide fast access to space for substantive scientific investigations and flight testing of new technology.

The balloon program in particular is important for advancing detection of the cosmic microwave background and particle detection. Theory and Computation Networks. To enable the large-scale theoretical investigations identified as science priorities by this survey, the committee proposes a new competed program to support coordinated theoretical and computational research—particularly that of fundamental relevance to upcoming space observatories. LSST is a multipurpose observatory that will explore the nature of dark energy and the behavior of dark matter, and will robustly explore aspects of the time-variable universe that will certainly lead to new discoveries.

LSST addresses a large number of the science questions highlighted in this report. Over a year lifetime, LSST will be a unique facility that, building on the success of the Sloan Digital Sky Survey, will produce a billion-megabyte publicly accessible database. The project is relatively mature in its design.

Independent review judged the cost and schedule risk, as well as the technical risk, to be medium low. The top rank accorded to LSST is a result of 1 its compelling science case and capacity to address so many of the science goals of this survey and 2 its readiness for submission to the MREFC process. New discoveries and technical advances enable small- to medium-scale experiments and facilities that advance forefront science. The committee recommends a new competed program to significantly augment the current levels of NSF support for mid-scale programs. Transformative advances in optical and infrared OIR astronomy are now possible by building adaptive optics telescopes with roughly 10 times the collecting area and up to 80 times the near-infrared sensitivity of current facilities.

A federal investment to provide access for the entire U. Two U. The committee recommends that a choice between. A schedule and budget plan should then be developed. The operations federal cost share is expected to carried by NSF-Astronomy. Although the committee did not analyze these estimates in detail, they are far below the usual rule of thumb for large projects 10 percent of construction costs per year. The past decade has seen the coming of age of very high energy tera-electron-volt TeV gamma-ray astronomy. Plans are underway to capitalize on recent scientific advances by building a large facility that uses light created as gamma rays interact with the atmosphere and that will achieve an order-of-magnitude greater sensitivity compared to current telescopes.

This new gamma-ray observatory will detect a wide variety of high-energy astrophysical sources and seek indirect evidence for dark matter annihilation. The technical risk was judged to be medium low. The committee recommends. This led him to the three laws of planetary motion that bear his name see Kepler's laws. Galileo Galilei — made fundamental discoveries in both astronomy and physics; he is perhaps best described as the founder of modern science.

Galileo was the first to make astronomical use of the telescope. His discoveries of the four largest moons of Jupiter and the phases of Venus were persuasive evidence for the Copernican cosmology. His discoveries of craters on the moon and blemishes on the sun sunspots discredited the ancient belief in the perfection of the heavens. These findings were announced in The Sidereal Messenger, a small book published in However, Galileo was called before the Inquisition and forced to renounce publicly all doctrines considered contrary to Scripture.

Isaac Newton — , possibly the greatest scientific genius of all time, succeeded in uniting the sciences of astronomy and physics. His laws of motion and theory of universal gravitation provided a physical, dynamic basis for the merely descriptive laws of Kepler. Until well into the 19th cent. Edmond Halley 's prediction that the comet of would return in was refined by A.

Clairault, who included the perturbing effects of Jupiter and Saturn on the orbit to calculate the nearly exact date of the return of the comet. In , William Herschel accidentally discovered a new planet, eventually named Uranus.

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Discrepancies between the observed and theoretical orbits of Uranus indicated the existence of a still more distant planet that was affecting Uranus's motion. Adams and U. July Astronomers announced that a neutrino first detected in Antarctica had been linked to a supermassive black hole in a distant galaxy, some 4 billion light-years from Earth. The finding was expected to help future detections of high-energy particles form space. July A red blur lit up night skies on our blue marble for part of the summer as Earth played a game of monkey in the middle with Mars and the sun.

Later in the month, the Martian orbit brought it within about Another great night for pictures of the moon. After they finish testing the capsules next year, these nine women and men could be the first astronauts to fly aboard the Crew Dragon and Starliner. As it orbited the sun in October, it recorded the fastest ever heliocentric speed by something humans launched.

Ahead of schedule, it recorded its first image of MU69 also nicknamed Ultima Thule, the remote world it will fly by on Jan. The reports roiled space relations between the United States and Russia. Another Soyuz was able to launch again in December, averting a scenario where the International Space Station may have been left with no crew early next year. They will study how its oddball makeup came to be. Though out of power, Dawn will continue to orbit Ceres for at least 20 years, possibly decades longer.

It was a harbinger of a change to the space launch business, which might become dominated by an assortment of small rocket providers such as Rocket Lab. In the years ahead, it will listen for marsquakes and record a sonogram of the inside of Mars.

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It will survey the object and try to collect samples to send back home in Spin the moon below and see the approximate landing site:. They collected samples that will be sent back to Earth to aid the investigation into how the leak came to be.

ESO Top 10 Astronomical Discoveries | ESO

You might still be able to see it. The Lunar X Prize ended with no winner. A Super Blue Blood Moon occurred.