Romans 1:20 NIV

Isaiah 40:26 NIV
Lift up your eyes and look to the heavens: Who created all these? He who brings out the starry host one by one and calls forth each of them by name. Because of his great power and mighty strength, not one of them is missing.

Psalm 19:1-6 NIV
The heavens declare the glory of God; the skies proclaim the work of his hands. Day after day they pour forth speech; night after night they reveal knowledge. They have no speech, they use no words; no sound is heard from them. Yet their voice goes out into all the earth, their words to the ends of the world. In the heavens God has pitched a tent for the sun.     It is like a bridegroom coming out of his chamber, like a champion rejoicing to run his course. It rises at one end of the heavens and makes its circuit to the other; nothing is deprived of its warmth.

Psalm 33:6-9 NIV
By the word of the Lord the heavens were made, their starry host by the breath of his mouth. He gathers the waters of the sea into jars ; he puts the deep into storehouses. Let all the earth fear the Lord; let all the people of the world revere him. For he spoke, and it came to be; he commanded, and it stood firm.

Romans 1:19 NIV
since what may be known about God is plain to them, because God has made it plain to them.

Romans 2:15 NIV
They show that the requirements of the law are written on their hearts, their consciences also bearing witness, and their thoughts sometimes accusing them and at other times even defending them.)