Roche limit

 

The closest two astronomical bodies can get before one is broken up by tidal effects.

Taygeta -proper name of 19 Tauri, a triple star system in the constellation Taurus, 440 lys from earth.

Edited July 22, 201510 yr by ACG52

Accretion disc

 

High speed, high energy matter spiraling into a black hole.

Catena - A chain of impact craters.

Andromedids. a meteor shower radiating out from the constellation Andromeda. While presently very weak, in the years 1872 and 1885 they put on a impressive display.

Saros Cycle - a period of 223 synodic months that can be used to predict solar and lunar eclipses. The saros cycle is equal to 6,585.3 days (18 years 11 days 8 hours).

Eotvos experiment

 

Confirmed that different objects/composition fall at the same speed in a gravitational field.

Spicules- small,short lived patterns of gas seen in the atmosphere of the Sun.

spectroheliograph - An instrument which allows the entire Sun to be photographed in the light of a single spectral line.

Heliopause - the point in space at which the solar wind meets the interstellar medium..

Enterprise

 

One of the space shuttles, and, a famous 23rd century starship on a 5 yr mission.

Endeavour- the fifth and last shuttle built. It flew 25 missions the first in May of 1992 and the last in May of 2011.

Red-shift

 

The shifting of spectral lines towards longer wavelengths due to recession.

Thalassa - A moon of Neptune discovered in 1989 by the Voyager II spacecraft.

Aldebaran -an orange giant star located about 65 light years away in the zodiac constellation of Taurus. With an average apparent magnitude of 0.87 it is the brightest star in the constellation and is one of the brightest stars in the nighttime sky.

Nadir - The point on the celestial sphere directly below the observer and opposite the zenith.

We're repeating ourselves. The threads too large to go back and see if something has been used.

We're repeating ourselves. The threads too large to go back and see if something has been used.

I overlooked your repetition of my saros entry, can you see your way to overlook my repetition of your nadir?

 

Naiad = Another moon of Neptune discovered by Voyager II.

Oh certainly. I was just commenting on how large this has grown. I've even repeated myself.

 

Demeter - the tenth moon of Jupiter , as well as the name of the ship which brought Count Dracula to England.

RR Lyrae Star - a periodic variable star used as a standard candle in measuring distances.

Recombination era - the period when the temperature of the universe dropped low enough for electrons to be captured by protons, aprox 380,000 years after inflation.

Autumnal Equinox - The time in September when day & night are of equal length as the Sun crosses the celestial equator.

Tip: So as not to have to reread the entire thread, use the 'Search this Topic' function to check for repeat entries before posting.

XUV - abbreviation for extreme ultraviolet.

Vacuum energy

 

Particles and anti-particles being continuously created and annihilated may supply the energy density for the cosmological constant.

Ymir - a moon of Saturn. In Norse mythology Ymir was the first creature created.