
1) Chevron or BP 2) ExxonMobil
Found on
https://www.crosswordclues.com/clue/gas-giant

A gas giant (sometimes also known as a jovian planet after the planet Jupiter, gaseous giant, or giant planet) is a large planet that is not primarily composed of rock or other solid matter. There are four gas giants in the Solar System: Jupiter, Saturn, Uranus and Neptune. However, astronomers sometimes categorize Uranus and Neptune as `ice gian....
Found on
http://en.wikipedia.org/wiki/Gas_giant

Planets made primarily of gas, these include Jupiter, Saturn, Uranus, and Neptune.
Found on
http://planetfacts.org/space-terms/

A large planet composed mostly of gas, e.g. the Jovian planets.
Found on
http://www.braeunig.us/space/glossary.htm

A large planet composed mainly of hydrogen and helium, together with some methane, ammonia, and other light substances, but with a substantial metal-rock core around which the lighter materials that form the bulk of the object have accreted. The four gas giants of the solar system are, in order of...
Found on
http://www.daviddarling.info/encyclopedia/G/gasgiant.html

Big planets made nearly completely of gas (eg Jupiter, Saturn).
Found on
http://www.solarspace.co.uk/Glossary2.php
No exact match found.