The short answer is we have no explanation.
From the first hadith in Sahih Muslim, partially quoted below, narrated on the authority of 'Umar ibn al-Khattāb, we know that belief in angels is one of the six articles of imān (faith):
قَالَ فَأَخْبِرْنِي عَنِ الإِيمَانِ. قَالَ: أَنْ تُؤْمِنَ بِاللَّهِ وَمَلاَئِكَتِهِ وَكُتُبِهِ وَرُسُلِهِ وَالْيَوْمِ الآخِرِ وَتُؤْمِنَ بِالْقَدَرِ خَيْرِهِ وَشَرِّهِ. قَالَ صَدَقْتَ
He (the inquirer) said: Inform me about Iman (faith). He (the Holy Prophet) replied: That you affirm your faith in Allah, in His angels, in His Books, in His Apostles, in the Day of Judgment, and you affirm your faith in the Divine Decree about good and evil. He (the inquirer) said: You have told the truth.
— Sahih Muslim, Book 1, Hadith 1
The six articles of faith involve, to one degree or another, a belief of an unseen. In the case of angels, it is all a matter of the unseen, which means that we can only attribute to them what has reached us through a verse of the Qur'an or a hadith by the Prophet ﷺ, for example being created of light:
عَنْ عَائِشَةَ، قَالَتْ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم: خُلِقَتِ الْمَلاَئِكَةُ مِنْ نُورٍ وَخُلِقَ الْجَانُّ مِنْ مَارِجٍ مِنْ نَارٍ وَخُلِقَ آدَمُ مِمَّا وُصِفَ لَكُمْ
'A'isha reported that Allah's Messenger (ﷺ) said: The Angels were born out of light and the Jinns were born out of the spark of fire and Adam was born as he has been defined (in the Qur'an) for you (i. e. he is fashioned out of clay).
— Sahih Muslim, Book 55, Hadith 78
When saying that angels are created from light, this does not necessarily mean that this is their current form (similar to us as humans being created from dust but or form does not indicate so). In the Qur'an:
يُدَبِّرُ الْأَمْرَ مِنَ السَّمَاءِ إِلَى الْأَرْضِ ثُمَّ يَعْرُجُ إِلَيْهِ فِي يَوْمٍ كَانَ مِقْدَارُهُ أَلْفَ سَنَةٍ مِّمَّا تَعُدُّونَ
He arranges [each] matter from the heaven to the earth; then it will ascend to Him in a Day, the extent of which is a thousand years of those which you count.
— Surat As-Sajdah 32:5
Ibn Kathir, in his tafsīr, aid that an angel descends a distance that is normally covered in 500 years one way in a split of a second. Such matters of the unseen have no scientific explanation; it is a matter of faith. Furthermore, your question implies an assumption that angels are capable of doing so willingly, and that angels are bound by the same laws of physics that apply to us, both of which there is no Islamic textual evidence to confirm or deny.
Moreover, science evolves over time. Until the turn of the 20th century, Newton laws were perceived to be an accurate representation of the physics of motion; that is, until Einstein produced his theory of special relativity then his theory of general relativity. Now we know that kinematic time dilation (Ives–Stilwell experiment) and gravitational time dilation (Pound–Rebka experiment) cancel out (among several other experiments). Our understanding of the universe and where the limits of laws of physics that we currently hold to be universal are drawn will continue to evolve:
سَنُرِيهِمْ آيَاتِنَا فِي الْآفَاقِ وَفِي أَنفُسِهِمْ حَتَّىٰ يَتَبَيَّنَ لَهُمْ أَنَّهُ الْحَقُّ ۗ أَوَلَمْ يَكْفِ بِرَبِّكَ أَنَّهُ عَلَىٰ كُلِّ شَيْءٍ شَهِيدٌ
We will show them Our signs in the horizons and within themselves until it becomes clear to them that it is the truth. But is it not sufficient concerning your Lord that He is, over all things, a Witness?
— Surat Fussilat 41:53