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ableto discoverLASCO comets

of dust and of ice made from methane , ammonia , carbon dioxide , and water(passive) are composedComets

in which armchair astronomers have used SOHO datato discovercomets

of rocky material , ice , and gas that originate in the Kuiper Belt and the Oort Cloud(passive) are composedComets

by SOHO Comets(passive) discovered byComets

that images taken by the SOHO spacecraft have been usedto discovercomets

amateur astronomersdiscovercomets

amateur astronomersdiscoveringcomets

by amateur astronomers(passive) discovered bycomets

by amateur astronomers(passive) are ... discovered by Comets

amateur astronomerscan ... do discovercomets

by amateur astronomers(passive) are ... discovered Comets

Amateur astronomershave discoveredcomets

Four other amateurs , in two teams of two , used their own CCD 'sto discovercomets

by astronomer Terry Lovejoy(passive) discovered bythe comets

of water in the form of ice , dust , frozen carbon dioxide and ammonia(passive) are composedComets

Caroline Herscheldiscoveredcomets

the Oort cloud ... mass extinctions on Earthwhere ... originatecomets

by the Panoramic Survey Telescope and Rapid Response System(passive) discovered bycomets

Professional astronomersdiscovercomets

even amateur astronomers have used themto discovercomets

by the LINEAR project List of comets(passive) discovered bycomets

of ice , dust , and rocky debris(passive) are composed Comets

by the SOHO spacecraft(passive) discovered bythe comets

the SOHO and STEREO spacecraft(passive) discovered bycomets

Small perturbations in the gravitational field by large planetscan causecomets

Her sophomore year , she helpedleadthe Comets

an oort cloudwhere ... originatecomets

the Oort cloudwhere ... originatecomets

of ice , gases , and dust(passive) are composedComets

of ice , dust and rock(passive) are composedComets

for large venues , stadiums or outdoor use(passive) are designedComets

by the SOHO orbiting observatory(passive) discovered bythe comets

of ice and dust(passive) are composedComets

of dust and ice(passive) are composedComets

of ice and dust(passive) are composed mostlyComets

of ice and dust(passive) are composed primarilyComets

of ice and dust(passive) are composedComets Comets

NASA space probes like WISEhave discoveredcomets