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2. List of artificial objects in heliocentric orbit - Wikipedia

   en.wikipedia.org/wiki/List_of_artificial_objects...

   Below is a list of artificial objects currently in heliocentric orbit.This list does not include upper stages from robotic missions (only the S-IVB upper stages from Apollo missions with astronauts are listed), objects in the Sun–Earth Lagrange points or objects that are escaping from the Solar System.

3. Schwarzschild geodesics - Wikipedia

   en.wikipedia.org/wiki/Schwarzschild_geodesics

   Schwarzschild geodesics pertain only to the motion of particles of masses so small they contribute little to the gravitational field. However, they are highly accurate in many astrophysical scenarios provided that m {\textstyle m} is many-fold smaller than the central mass M {\textstyle M} , e.g., for planets orbiting their star.

4. Orbital elements - Wikipedia

   en.wikipedia.org/wiki/Orbital_elements

   Real orbits have perturbations, so a given set of Keplerian elements accurately describes an orbit only at the epoch. Evolution of the orbital elements takes place due to the gravitational pull of bodies other than the primary, the nonsphericity of the primary, atmospheric drag , relativistic effects , radiation pressure , electromagnetic ...

5. Asteroid - Wikipedia

   en.wikipedia.org/wiki/Asteroid

   The majority of known asteroids orbit within the asteroid belt between the orbits of Mars and Jupiter, generally in relatively low-eccentricity (i.e. not very elongated) orbits. This belt is estimated to contain between 1.1 and 1.9 million asteroids larger than 1 km (0.6 mi) in diameter, [ 44 ] and millions of smaller ones.

6. Oil heater - Wikipedia

   en.wikipedia.org/wiki/Oil_heater

   An oil heater, also known as an oil-filled heater, oil-filled radiator, or column heater, is a common form of convection heater used in domestic heating. Although filled with oil , it is electrically heated and does not involve burning any oil fuel ; the oil is used as a heat reservoir (buffer).

7. Orrery - Wikipedia

   en.wikipedia.org/wiki/Orrery

   Some planetariums have taken advantage of this to use orreries to simulate planets and their moons. Thus Mercury orbits the Sun in 0.24 of an Earth year, while Phobos and Deimos orbit Mars in a similar 4:1 time ratio. Planetarium operators wishing to show this have placed a red cap on the Sun (to make it resemble Mars) and turned off all the ...

8. Spitzer Space Telescope - Wikipedia

   en.wikipedia.org/wiki/Spitzer_Space_Telescope

   During the warm mission, the two short wavelength channels of IRAC operated at 28.7 K and were predicted to experience little to no degradation at this temperature compared to the nominal mission. The Spitzer data, from both the primary and warm phases, are archived at the Infrared Science Archive (IRSA).

9. Chip heater - Wikipedia

   en.wikipedia.org/wiki/Chip_heater

   The chip heater is a single point, tankless, domestic hot water system popular in Australia and New Zealand from the 1880s until the 1960s. Examples of this form of domestic water heater are still in use. The chip heater consisted of a cylindrical unit with a fire box and flue, through which a water pipe was run. Water was drawn from a cold ...