Space 
To see or dream that you are in space indicates that you are a very inquisitive person who enjoys seeking the truth. You form your own opinions and beliefs rather than adopting those of others.
Falling
It can be theorized that to dream of falling is a physical sensation of a drop on blood pressure. As this registers in the brain, the subconscious will alert you of it in this fashion. It produces a sinking feeling such as this. There is however, a religious side to this concept as well. In Christianity, a realm of eternal suffering is located beneath the surface of the Earth. It is called Hell. It is believed to be home to Demons, or Fallen Angels. These Angels were once in the paradise-like realm among the clouds called Heaven. Greed and jealousy however, turned them cruel and full of hate. This caused them to 'fall' down to the underworld.
Because of this, it is thought by some that to dream of falling represents your fall from purity and suggests that you have strayed from your spiritual path. Perhaps you have cheated someone or misled another. One may have this dream as a sign that they need to check and make sure that their thoughts are noble before they act on them.
But the most widely accepted meanings of falling dreams have nothing to do with science, nor with religion. Generally, if you fall within a dream, it is thought to have to do with balance, or rather a lack thereof. Most likely you have been increasingly stressed due to a recent failure in your life whether it is associated with your job, schooling or a relationship. This fall from glory is dreamt for the purpose of telling the dreamers to get up, dust themselves off and keep on trying.
It is also suspected that to dream of falling stands for your feeling of being below everyone else. The dreamer is belittling or torturing conscience to self-causing a low self-esteem. This type of dream is trying to make them aware of this and show them that they need to have more confidence in themselves and become well rooted so that they will not 'fall' at the first sign of opposition. They need to stand strong.
Spaceship
To dream of a spaceship indicates that you are imaginative and artistic. It suggests that you should embark on a mission of inner discovery and comprehension. Change your outlook on a certain issue, even if it seems strange and peculiar.
Outer Space
To dream of outer space suggests the sudden appearance of something or someone out of nowhere.
UFO
To dream of an UFO represents that you need to find a more devout purpose in your life. On the other hand, when you see an UFO in your dream may also point out that you are feeling separation by those around you. The dream can also be a metaphor for you having a 'dazed' or 'spacey' attitude. You may need to become a bit more realistic and come back to earth.
Room
To dream that you are in a room relates to a particular aspect of your personality or relationship with people. Dreams about different rooms may correlate to subconscious thoughts, desires, and facets of your identity.
To dream that you find or discover new rooms signifies new vitality, growing emotional maturity, and capability in meeting new challenges.
To see a comfortable room signifies wealth and satisfaction in real life.
To notice a dark, scary, or small room connotes feelings of being penned up, trapped, or repressed.
*See Bathroom or Kitchen
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Silo
To dream of a silo implies that you should be more frugal with your finances. It's possible that you are purchasing items that you don't need or are too expensive. You should instead try to save and accumulate a nest egg.
Comb
To dream that you are combing your hair implies that aspects of your life are in disarray. You should analyze your current position and determine if there are any areas that need to be worked on.
Thumb
To dream about a thumb tells you that you must 'get a grip' on life. It represents strength and talent.
To dream about not having thumbs symbolizes being poor and friendless.
A dream in which you have a huge thumb foretells a quick succession of accomplishments.
To dream about a lengthy nail on your thumb means that you are yielding to the temptation of immoral things.
X-Ray
If you are being x-rayed in a dream, it is an indication that someone or some situation is deceiving you. You need to look carefully at the situation or person and consider their motives. Conversely, you may solve a current issue or problem soon.
Galaxy
To dream about the galaxy signifies your imagination. It also indicates that you are taking in the big picture and are more in touch with the world and events around you.
Orphan
To dream of an orphan represents worries of desertion and feelings of solitude and rejection.
A dream of yourself consoling orphans shows your sympathy for sadness experience by others. This will move you to sacrifice personal pleasures in order to extend assistance to those in need.
Pickax
To dream of a pickax symbolizes your brutal sexual urges and hang ups. Let go of your inhibitions.
Sneeze
To dream that you sneeze implies that you are satisfied with your current position and situation in life. You are experiencing happiness and great comfort.