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A radio telescope is a specialized antenna and radio receiver used to detect radio waves from astronomical radio sources in the sky. Radio telescopes are...

Olbers's paradox, also known as the dark night paradox, is an argument in astrophysics and physical cosmology that says that the darkness of the night...

An Earth mass (denoted as M E {\displaystyle M_{\mathrm {E} }} or M ⊕ {\displaystyle M_{\oplus }} , where 🜨 is the standard astronomical symbol for Earth)...

Zond 6 was a formal member of the Soviet Zond program, and an unpiloted version of the Soyuz 7K-L1 crewed Moon-flyby spacecraft. It was launched on a lunar...

In planetary astronomy and astrobiology, the Rare Earth hypothesis argues that the origin of life and the evolution of biological complexity, such as sexually...

Laurel Blair Clark (née Salton; March 10, 1961 – February 1, 2003) was an American NASA astronaut, medical doctor, United States Navy captain, and Space...

In celestial mechanics, the standard gravitational parameter μ of a celestial body is the product of the gravitational constant G and the total mass M...

Gamma Leonis (γ Leonis, abbreviated Gamma Leo, γ Leo), also named Algieba /ælˈdʒiːbə/, is a binary star system in the constellation of Leo. In 2009, a...

Eta Geminorum (η Geminorum, abbreviated Eta Gem, η Gem), formally named Propus /ˈproʊpəs/, is a triple star system in the constellation of Gemini. It is...

15810 Arawn (provisional designation 1994 JR1) is a trans-Neptunian object (TNO) from the inner regions of the Kuiper belt, approximately 133 kilometres...

Map all coordinates using OpenStreetMap Download coordinates as: KML GPX (all coordinates) GPX (primary coordinates) GPX (secondary coordinates) This is...

4897 Tomhamilton, provisional designation 1987 QD6, is a stony asteroid from the outer region of the asteroid belt, approximately 14 kilometers in diameter...

A nuller is an optical tool used to block a strong source so that fainter signals near that source can be observed. An example of a nuller is being employed...

Alfred Bohrmann (February 28, 1904 – January 4, 2000) was a German astronomer and discoverer of minor planets. He did his Ph.D. dissertation in 1927 at...

(394130) 2006 HY51 is a near-Earth object of the Apollo asteroid group with a high orbital eccentricity, approximately 1.2 kilometers in diameter. It was...

(374158) 2004 UL is a sub-kilometer asteroid on an outstandingly eccentric orbit, classified as near-Earth object and potentially hazardous asteroid of...

Lunar habitation is any long-term activity on the Moon, establishing human habitation on the Moon. Therefore, it is more than the particular surface space...

Leonard L. Amburgey (born 1945)[citation needed] is an American amateur astronomer, discoverer of minor planets and public-school teacher by profession...

Delta-Differential One-Way Ranging (or Delta-DOR, Δ-DOR for short) is an interplanetary radio-tracking and navigation technique. Radio signals from the...