What are the effects of a Stellium? Do i have one in my natal Chart?

A stellium is when 3 or more planets are in conjunction with each other. So the answer is yes, you do have a stellium. A stellium is a powerful powerful combination in a chart. You have Sun, Mercury (albeit in Virgo but still is conjunct with other planets), Venus, and Mars all in the 9th House of Higher Education, and Travel (of the mind and body). Since your sun is in Leo, you need to shine. Leo is the King and Queen of the Zodiac. Leos are somewhat vain about their appearance, but they are royalty for pete's sake! And you also like being a leader not a follower. Royalty doesn't follow, they get to say "Off with their head!" Leos are very loving and generous to those in their favor but if you shouldhumiliatee them or criticize them in any way, you will have just lost your Leo friend. Leo expects loyalty and will be loyal also to those that are loyal to them. It is all very conditional, this loving a Leo. When Mercury is closely conjunct the sun it is often called "combustible." Very bright . Very intellectual. Leo Venus will want someone attractive on their arm, sort of a "trophy wife." Leo is very concerned about appearances. They might bend the truth because Leos always want to be seen in a positive light. Mars in Leo is strong because Leo is ruled by the sun so you are not a wimp. You will stand up for yourself (or you should!) and always be sure that any battle that you fight is a worthy battle. This is where many people mess up with their Mars placement. Mars is the warrior in you. But warriors shouldn't waste their time on battles that are not worthy. Put all that energy into fighting for something worthwhile. A cause, a cure, a charity are all worthy of ones energy. As all these planets are in the 9th House, I strongly suggest you attend college or some type of specialization. That is needed particularly in these hard economic times. This will satisfy the energy of the 9th House. You might also begin reading some metaphysical books as the 9th house rules travel "of the mind." Meta means beyond. Beyond the physical. What we cannot see, The intangibles of life. Al travel is a positive way to satisfy the 9th house of learning about other cultures of the world. There are so many wonderful ways to learn about others on this planet. Take advantage of each and every one that comes your way. Congratulations! You have aSelimm! Good luck and bless you.