Mercury is seen as a dim star without a telescope, although what it looks like is dependent on it's orbital position and the amount of light pollution in your area. Unfortunately, Mercury's close orbit with the Sun often causes the Sun to "hide" Mercury in a glare during sunrise and sunset and when it is visible to the naked eye, which is rare, it's very low to the horizon. However, if the Sun weren't so blindingly bright, you could see Mercury transit past the Sun as a black dot moving across the Sun but this is only visible with a solar telescope or a telescope with a solar filter.
Mercury, Venus, Mars, Jupiter, and Saturn are visible from Earth without a telescope. At certain times, for those with excellent vision, Uranus is visible. Some planets are best viewed just before dawn.
Saturn is one of five planets that you can see in the night sky without a telescope. The others are Mercury, Venus, Mars, and Jupiter. Anyone who spent a good deal of time watching the night sky would realize that these objects moved relative to the background of stars.
The Hubble Space Telescope cannot see Mercury clearly because Mercury is too close to the Sun, making it difficult for Hubble to observe without damaging its instruments. Additionally, Mercury's small size and proximity to the bright glare of the Sun make it challenging to distinguish from the surrounding brightness.
Yes, all of the planets in from the earth display phases when viewed form earth.
You can see the six ancient planets without a telescope when they are visible, and in theory you can also see Uranus in perfect conditions. Neptune needs a moderate-sized telescope like a 3" refractor.
look through a telescope at night
Yes. You are able to see Jupiter with a telescope from Earth at certain points in the year.
Not without a very good telescope. Triton, Nereid and Larissa might be viewable, but the other 10 would only be viewable with a ground based observatory.
Yes, but only for a short time after sunset or before sunrise. It would not be seen throughout the night, because it is close to the sun. You would not see it every night, only on rare occasions, because it is so close to the sun.
The Earth is definitely the #1 easiest. Next in line would be Mercury, Venus, Mars, Jupiter, and Saturn. Each of those is visible without a telescope, so you'd know exactly where to point your telescope by seeing the planet with your eye first. The brightest planet that you do need a telescope to see is Uranus. So you definitely won't miss it when you're pointed at it, but you need to know where to point.
The Earth is definitely the #1 easiest. Next in line would be Venus, Mars, Jupiter, Saturn, and Mercury. Each of those is visible without a telescope, so you'd know exactly where to point your telescope by seeing the planet with your eye first. The brightest planet that you do need a telescope to see is Uranus. So you definitely won't miss it when you're pointed at it, but you need to know where to point.
All of them Without a telescope: Mercury, Venus, Mars, Jupiter, Saturn and on a very good night Uranus. With a telescope: All of the above plus Neptune.