I rise to the top, yet I am fully spent, often from heat, but I am not always hot. I displace and replace that which you need, but I am not a gas. If you see me, find the source, or you may find your world asunder.

i am a spacecraft... orbiting the largest planet in your solor system. i have discovered weird radiation from the planet so far... the planet that im orbiting is gasious. what am i?

I'll almost always sink in water, no matter how many times I'm skipped I could roll or just sit there, depends on my size and shape I'm almost everywhere in some way If you can't get this you might be between me and a hard place What am I?

A vast expanse, a heavenly sea, The Milky Way, Andromeda galaxy. But look closely, and you will find, they are made up of millions of my kind. Hurry, make a wish, and don't delay! Send me your dreams before I fade away.

Soft as a cloud, with a gentle purr, A silent stalker in whiskers and fur. A playful spirit with lives to spare, Sleeping the days away without a care.