of dust , ice and small rock particles(passive) are composedComets

of ice , dust and small rock - like particles(passive) are composedcomets

of frozen gases , water , ice , dust and rock(passive) are composedComets

mostly of water ice and dust particles that were formed in the cold outer planet system(passive) are composedComets

MASTER 12(passive) discovered byCOMETS

MASTER 19(passive) discovered byCOMETS

largely of ice ( mostly water and carbon dioxide(passive) are composedComets

of significant fractions of water ice , dust , and carbon - based compounds(passive) are composedComets

of conglomerations of ice and rock(passive) are composedComets

partly of extraterrestrial ice(passive) after all ... are composedComets

two instruments that could be usedto discovercomets

mostly of water ice and rock(passive) are composedCOMETS

of material left over from the formation of our solar system and formed around the same time as asteroids(passive) are also composedComets

of ice , gas , and dust—primitive debris(passive) are composedComets

of frozen volatile materials [ chiefly water , carbon dioxide ammonia and methane(passive) are composedComets

of bits of rocky debris held together by frozen gases , ice , and water(passive) are composedComets

After the sun ignited , the energy from the event blew dust and other materials to the outer edge of the solar systemcreatingcomets

of a central icy lump of material — the nucleus — and when the comet becomes heated by solar energy , ices sublime , blasting vapor and dust into space(passive) are composedComets

successive break ups from a single large parent comet which passed very near the sun in the twelfth century(passive) created bycomets

amateur astronomers(passive) are mostly discovered byComets

the outer planets ... ableto influencecomets

the technologyto preventcomets from hitting the earth

that individual or group(passive) discovered bycomets

aglow ... the heat and radiation from the Sun(passive) ’re set ... byComets

the SOHO space telescope(passive) discovered bycomets

of a mixture of rock and frozen gases(passive) are composedComets

mostly of ices(passive) are composedComets

global warming(passive) being caused bycomets

of hundreds of billion of metric tons of antimatter or mirror matter(passive) are composedComets

of a mixture of ices and rocky material(passive) are composedComets

electrical reactions occurring in the vault of the sky(passive) are created byComets

mostly of frozen carbon monoxide and carbon dioxide(passive) are composedComets

The view - through ... that helpsto discovercomets

of dust and frozen gases(passive) are composedComets

primarily of rocky and metallic materials(passive) are composedComets

several other colleagues at Siding Springshave discoveredcomets

of 50 % water and excess materials from the Big Bang(passive) are composedComets

about 2 to 3 months before they are clearly visible from Earth(passive) are usually discoveredComets

to be composed of antimatter(passive) were discoveredComets

2 CometsdiscoveredComets discovered[edit