Will the people on the earth be able to see the angels, at the second advent of Jesus?

Matthew 13:39 The enemy that sowed them is the devil; the harvest is the end of the world; and the reapers are the angels.

  41 The Son of man shall send forth his angels, and they shall gather out of his kingdom all things that offend, and them which do iniquity;

  49 So shall it be at the end of the world: the angels shall come forth, and sever the wicked from among the just,

Mark 8:38 Whosoever therefore shall be ashamed of me and of my words in this adulterous and sinful generation; of him also shall the Son of man be ashamed, when he cometh in the glory of his Father with the holy angels.

II Thessalonians 1:7 And to you who are troubled rest with us, when the Lord Jesus shall be revealed from heaven with his mighty angels,

  8 In flaming fire taking vengeance on them that know not God, and that obey not the gospel of our Lord Jesus Christ:

Joel 3:11 Assemble yourselves, and come, all ye heathen, and gather yourselves together round about: thither cause thy mighty ones to come down, O LORD.

Will it be a terrifying sight?