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Topic Review
Hydrus (Constellation)
Hydrus is a small and faint constellation in the southern celestial hemisphere. It is named after the Latin word for "male water snake" and is often depicted as a water snake winding its way through the southern skies. 
  • 321
  • 15 Mar 2024
Topic Review
Micro-Imaging Dust Analysis System
The Micro-Imaging Dust Analysis System (MIDAS) is one of several instruments on the European Space Agency's Rosetta mission which studied in-situ the environment around the active comet 67P/Churyumov–Gerasimenko as it flew into the inner Solar System. MIDAS is an atomic force microscope (AFM) designed to collect dust particles emitted from the comet, and then scan them with a very sharp needle-like tip to determine their 3D structure, size and texture with very high resolution (4 nanometers).
  • 316
  • 20 Oct 2022
Topic Review
List of Unnumbered Minor Planets: 2002 R–S
This is a partial list of unnumbered minor planets for principal designations assigned between 1 September 2002 and 31 September 2002 (R–S).
  • 313
  • 14 Nov 2022
Topic Review
Space Apps
Space Apps is annual NASA's global hackathon, first held in April 2012, and serves as innovation incubation and civic engagement program. NASA and its partners put out challenges relating to current work for which space enthusiasts around the world of all backgrounds can develop innovative solutions (which can be more than just apps!), particularly focusing on use of NASA data and promoting education. The project, formerly run by NASA's Office of the Chief Information Officer, is part of NASA's Earth Science Mission Directorate and is a part of the Open Government Initiative founded under President Barack Obama "creating an unprecedented level of openness in Government." It also fulfills the United States’ commitments to the Open Government Partnership.
  • 310
  • 08 Nov 2022
Topic Review
List of Jupiter Trojans (Trojan Camp) (300001–400000)
This is a partial list of Jupiter's L5 trojans (60° behind Jupiter) with numbers 300001–400000 (also see main page).
  • 302
  • 24 Nov 2022
Topic Review
List of Unnumbered Minor Planets: 2001 A–R
This is a partial list of unnumbered minor planets for principal designations assigned between 1 January 2001 and 15 September 2001 (A–R).
  • 301
  • 24 Oct 2022
Topic Review
List of Unnumbered Minor Planets: 2001 S–Y
This is a partial list of unnumbered minor planets for principal designations assigned between 16 September 2001 and 31 December 2001 (S–Z).
  • 298
  • 29 Nov 2022
Topic Review
Apus
Apus is a southern celestial constellation first introduced by the International Astronomical Union (IAU) in the early 20th century. Its name, derived from the Greek word for "bird of paradise," symbolizes a bird-like creature, though it does not represent any specific bird species. Positioned in the southern sky, Apus is notable for its lack of bright stars, making it a challenge for observers in light-polluted areas but a rewarding sight under pristine conditions for those exploring the southern heavens.
  • 291
  • 29 Feb 2024
Topic Review
Equuleus
Equuleus, Latin for "the little horse," is one of the 88 modern constellations recognized by the International Astronomical Union. Despite its small size and dim stars, Equuleus holds historical significance, dating back to ancient times when it was known as a separate constellation or asterism. Today, it remains a subtle yet intriguing feature of the night sky, nestled between the larger constellations of Pegasus and Delphinus.
  • 290
  • 15 Mar 2024
Topic Review
Atmospheric Transparency at Candidate Sites for Sub-Millimeter-Wave Telescopes
Radio astronomical observations at millimeter and submillimeter wavelengths are a very important tool for astrophysical research. However, there is a huge area in northeastern Eurasia, including the whole Russian territory, which lacks sufficiently large radio telescopes effectively operating at these wavelengths. 
  • 281
  • 03 Nov 2023
Topic Review
List of Unnumbered Minor Planets: 2003 A–R
This is a partial list of unnumbered minor planets for principal designations assigned between 1 January 2003 and 15 September 2003 (A–R).
  • 279
  • 28 Nov 2022
Topic Review
List of Unnumbered Minor Planets: 2004 A–Q
This is a partial list of unnumbered minor planets for principal designations assigned between 1 January 2004 and 31 August 2004 (A–Q).
  • 272
  • 24 Nov 2022
Topic Review
List of Unnumbered Minor Planets: 2004 T–Y
This is a partial list of unnumbered minor planets for principal designations assigned between 1 October 2004 and 31 December 2004 (T–Y).
  • 266
  • 26 Oct 2022
Topic Review
List of Unnumbered Minor Planets: 2004 R–S
This is a partial list of unnumbered minor planets for principal designations assigned between 1 September 2004 and 31 September 2004 (R–S).
  • 242
  • 10 Oct 2022
Topic Review
Corona Australis
Corona Australis, Latin for "Southern Crown," is a small constellation in the southern celestial hemisphere. Situated near the celestial equator, it represents a crown or wreath and is associated with various mythological interpretations across different cultures. Despite its modest size, Corona Australis contains several interesting celestial objects.
  • 237
  • 08 Mar 2024
Topic Review
Fine-Structure Classification of Solar Metric Radio Bursts
Radio bursts provide important diagnostics of energetic phenomena of the Sun. In particular, bursts in decimetric and metric wavelengths probe the physical conditions and the energy release processes in the low corona as well as their association with heliospheric phenomena. The advent of spectral radio data with high time and high frequency resolution has provided a wealth of information on phenomena of short duration and narrow bandwidth. Of particular value are spectral data combined with imaging observations at specific frequencies.
  • 235
  • 15 Jan 2024
Topic Review
The Kottler-Schwarzschild-Kiselev Spacetimes
The Kottler-Schwarzschild-Kiselev blackhole spacetimes are analytically studied. The instances of the gtt components of the metric tensor are considered, where it contains a linear term, a cosmological constant, and both a linear term and a cosmological constant, in the deSitter determination and in the anti-deSitter one. The Birkhoff theorem is proven to be obeyed. The infinite-redshift surfaces are written. The parameter space of the models which constrain the blackhole mass are analytically spelled out. The coordinate-singularity-avoiding coordinates transformations are newly found. The possibility to obtain a scheme geometrically-mimicking quintessence is ruled out. The weak-field limit is studied from the appropriate Christoffel symbol. The quantum regime is envisaged.
  • 68
  • 11 Nov 2024
Topic Review
Alternative General-Relativity-related experiments and Particle Physics
The use of quantum optical systems for investigation in General Relativity ad related theories, of which General Relativity is the weak-field limit is exposed; the analyses are based on the comparison of the properties of Astrophysical systems inferred form the quantum-optics techniques, which can compare Planck-scale physics.
  • 53
  • 12 Nov 2024
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