6. Jupiter has an apparent magnitude of -1.67, but an absolute magnitude of 25.87. Neptune has amagnitude of 7.84 but an absolute magnitude of 32.08. Which planet can you see with thenaked eye? Which can you see with a telescope only? If we imagine that these planets were at adistance of 10 parsecs, would we be able to see either of them with the Hubble telescope? UseGoogle or another to check the limiting magnitude of the Hubble space telescope.

Apparent magnitude gives us an idea about the brightness of an object appearing from the earth. It doesn't tell us about the object's actual brightness compared to the other objects in the universe. For example, Venus appears to be the brightest of all stars in the sky, appearing from the earth. This is because of its least distance from the earth. Otherwise, the objects far from the earth appear to be fainter. Absolute magnitude can be defined as the apparent magnitude of an object located 10 parsecs or 32.6 light-years.The apparent magnitude of Jupiter is -1.67. Its distance is lesser than that of Neptune from the earth, so Jupiter will appear brighter, and we will be able to see Jupiter from naked eyes. Neptune can be seen from a telescope only because its distance is very large from the earth and so our eyes will not be able to see it. If these planets were at a distance of 10parsecs, then surely we will be able to see them through Hubble as the farthest distance till now is 10-15 billion years seen from this. Hubble can detect objects having a 31st magnitude and are faint. It is expected to have a magnitude limit of 34th magnitude.Hence the Neptune is located at greater distance so it will be seen through a telescope whereas the Jupiter can be seen through naked eyes as due to less distance, it is brighter. Hubble telescope can help to look at distantly located planets.