Strange structure that appears when astronauts visit a planet

An astronaut lands on an unknown planet. Everything is foreign.

Two scientists explore another planet.

Two astronauts arrive on a strange planet and tour it in search of intelligent life; but when the encounter with the local civilization finally takes place, the mission of the travelers suffers a new and unexpected setback.

A strange phenomenon has been noticed on the outskirts of our Solar system that quickly approaches the Earth. It's called "Orion's Loop." A spaceship with a crew of people and androids identical to them is sent to intercept the anomaly. But strange events start happening as the spaceship approaches the mysterious loop.

A boy, who every night admired the beauty of the starry sky, noticed through his telescope that ominous-looking spots appeared on one beautiful and rainbow planet. He immediately realized that this was not good, and sent a self-constructed robot to the aid of the inhabitants of the mysterious planet.

A mysterious astronaut lands on a planet only to discover that things seems familiar.

A group of astronauts venture to a mysterious planet to claim the find of the century.

When the Viking space capsule suddenly returns to Earth from its long ago trip to Mars, it brings with it an intelligent visitor that is part "Alien" and part "ET". Encased in armor, it extends a human like form from its shell to examine its surroundings and shows an interest in humans including a soft caress of a female scientist prior to the Army killing it. This only enrages its sibling.

An astronaut enters a vortex and crash-lands on a parallel planet where he's not welcome.