As observed from Earth, the 'Far side of the Moon'. Such has been the Moon's attitude and movement throughout known history, no one has ever seen the far side of the Moon, until Spaceships and Astronauts were able to fly there.
Lots of things have not actually been seen. One such thing are black holes - because according to theory, they CANNOT be seen (at least, the Hawking Radiation would be way too weak to be seen); however, due to things happening in the surroundings of the black hole (basically, the accretion disk), some black holes are the brightest objects of the Universe!
A black hole, exoplanets. It has always been inferred.
The shape of the path of a planet or asteroid around the sun is
Oort cloud
The Oort cloud
in some imperfect fungi
Since we never seen Planet X, we don't know for sure. Astronomers are estimating its orbital period to somewhere between 10,000 to 20,000 years.
Never. No one has ever actually seen a proton; they're too small.
Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.Earth never passed through Halley's Comet. It has been seen from Earth on many occasions. This happens about every 75 or 76 years. The last time was in 1986 and the next time it is expected to be seen from Earth will be in 2061.
A black hole, exoplanets. It has always been inferred.
The Oort Cloud
The Oort cloud
Yes (since 1801).
Yes (since 1801).
It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.It has been seen by people for over 2000 years. It is not known who was the first person to actually see it. Many ancient astronomers would have seen it. It was not known as Halley's Comet then. It got that name when Edmond Halley, and English astronomer, predicted it would return in 1759. It is seen about every 75 or 76 years from Earth.
He has never been seen
Unicorns have never been seen. They are not real and never have been.
She has never been seen. She is a myth.
you
The number of planets never seen could be millions, billions, or trillions. We just have never seen them.
Gos uhas never been seen